Damp proofing invoice template UK (2026): DPC, DPM, CIS and VAT

A damp-proofing invoice has to explain moisture control work that sits in the fabric of a building, not a vague “damp sorted” line. “Injection done” does not tell a householder whether chemical DPC, tanking slurry, cavity membrane, plastering, timber treatment or mould wash were included. It does not tell a main contractor’s QS which property, purchase order or works package to release. It does not tell a CIS contractor how much is labour and how much is the direct cost of creams, gels, membranes, sump pumps and plaster you paid for.

The payer and the operation both matter. A damp-proofing contractor billing a private householder sends a normal invoice: no CIS. The same contractor billing a builder, housing association main contractor or refurbishment principal can be inside CIS. HMRC’s painting and decorating manual (CISR14250) lists certain types of damp-proofing treatments as within the Construction Industry Scheme. Separately, tanking, chemical DPC injection into walls, and installing damp-proof membranes that alter or repair a building typically sit under construction, alteration or repair of buildings or structures in CISR14100 / Finance Act 2004 section 74(2)(a). Private householders are not CIS contractors — see the public CIS overview.

VAT is separate. If you are VAT-registered, most damp-proofing, chemical DPC and tanking at an existing lived-in home is usually standard-rated at 20%. HMRC does not treat damp-proofing paints, creams or gels as energy-saving materials for reduced-rate claims (Revenue and Customs Brief 9 (2018)). Zero or reduced rates for qualifying new dwellings or certain conversions follow VAT Notice 708 — do not invent them for ordinary rising-damp work in an occupied home.

This guide gives copy-paste fields, a labour/materials split for DPC creams, membranes and plaster, deposits and stages for multi-room packages, four worked examples and a practical treatment of CIS, VAT and domestic reverse charge. Figures are illustrative only, not UK market rates or a price list. InvoiceAdept does not decide CIS or VAT status and does not file CIS300, VAT returns, Making Tax Digital updates or Self Assessment to HMRC. It does not issue Building Control certificates, PCA guarantees or insurance-backed guarantees.

Related templates: builder, plasterer, groundworker, deposit invoice, retention payments, domestic reverse charge, how to invoice a UK client as a tradesperson and InvoiceAdept vs InvoiceFree. This page focuses on damp proofing — chemical DPC, DPM, tanking, cavity drain membranes, rising damp remediation and related plaster — not general building packages or soft landscaping.

Rules and links were checked for this guide on 4 September 2026. General information only, not tax, legal, surveying, Building Regulations or guarantee advice. InvoiceAdept is from Tech Me Today Ltd, Companies House 15917255, ICO ZB944663.

In short

Start by identifying who pays you, what moisture-control system you installed, and whether the job alters or repairs a building under a construction contract.

Private householder, own home rising damp / tanking: no CIS. The householder is not a CIS contractor. If VAT-registered, ordinary damp-proofing at an existing lived-in home is usually 20%. Show survey, injection, membranes, plaster, timber work and waste clearly.

Chemical DPC / certain damp-proofing treatments for a CIS contractor: within CIS when a contractor pays you for construction operations. CISR14250 expressly lists certain types of damp-proofing treatments as within the scheme. Split labour from materials at direct cost (CISR15060 materials guidance).

Tanking, cavity membrane, structural DPM as building alteration/repair: typically within CIS under CISR14100 when a CIS contractor pays — construction, alteration or repair of buildings or structures.

Domestic reverse charge: may apply when both parties are VAT-registered, the payment is reported within CIS, and the customer is not an end user. Never reverse-charge a private householder.

Take a deposit before ordering long runs of membrane, specialist creams or sump equipment if your terms require one. Number and invoice that deposit. Then use recognisable stages: survey/strip, injection or tanking, membrane, plaster/finish, snag. Keep a variation for extra rooms or upgraded systems separate from the agreed package.

Use the invoice generator for a first invoice. InvoiceAdept Free is £0 for five invoices per month. Pro is £7.99 excl VAT and includes WhatsApp send. Pro+ is £12.99 excl VAT and includes CIS. Stripe’s own fees apply (UK cards 1.5%+20p; international 2.5%+20p), but InvoiceAdept adds no platform fee.

Who this damp-proofing invoice template is for

This template is for UK damp-proofing contractors, rising-damp specialists and waterproofing firms who need readable invoices for householders, landlords, builders and housing clients. It covers the paperwork pattern, not a price list and not a guarantee document.

• Chemical DPC / rising-damp injection contractors

• Tanking and basement waterproofing specialists (cementitious and cavity drain)

• Membrane and DPM installers working as part of damp packages

• Firms combining damp treatment with salt-resistant plaster and making-good

• Subcontractors to main contractors on damp, mould and condensation remediation packages

• Sole traders and limited companies who need CIS and VAT lines that match the payer

If your day job is general plastering, groundworks dig-outs or full builder packages, use the related plasterer, groundworker or builder guides and come back here for the damp-proofing lines.

Three damp jobs, three invoices

These three jobs can use similar creams or membranes but need different invoice logic.

A main contractor can be the CIS contractor even when the finished work serves a tenant or homeowner. If the builder or housing association contractor engages you, your invoice is to that contractor. That contractor-to-subcontractor payment is the one to test. If the householder hires and pays you directly, the householder invoice has no CIS.

What damp-proofing work belongs on the invoice

Do not compress a multi-room package into “supply and fix DPC”. Describe survey, strip-out, injection, membranes, tanking, plaster, timber and what another firm supplied.

If a specialist surveyor or guarantee provider invoices the customer directly, do not duplicate their charges. If you engage and pay a plasterer as part of your package, your customer sees your agreed package lines; keep the subcontractor’s invoice in your records.

What a UK damp-proofing invoice must include

The GOV.UK invoice particulars are the foundation:

• a unique identification number

• your business name, address and contact information

• the customer’s name and address

• a clear description of the goods or services

• the supply date and invoice date

• amounts charged, VAT if applicable and the total owed

A sole trader should show their own name as well as a trading name and an address where legal documents can be delivered. A limited company should use its registered company name, company number and registered office. VAT-registered businesses need the additional particulars in VATREC5010 and Notice 700/21, including VAT number, tax point, rates, net amounts and VAT in sterling.

Include the property address even if it matches the householder’s correspondence address. For contractor jobs add property list, block, purchase order, application number and week-ending date. A clear line lets accounts match your invoice to site records without calling the contracts manager.

Copy-paste damp-proofing invoice fields

Delete anything that does not apply. Do not leave CIS or reverse-charge placeholders on a private bill.

INVOICE NUMBER / INVOICE DATE / SUPPLY OR TAX-POINT DATE / DUE DATE

SUPPLIER
Business / trading name
Sole trader’s own name (if applicable)
Address for service / registered office
Company number (if limited)
UTR (when CIS applies)
VAT number (if VAT-registered)
Contact / email / phone

CUSTOMER
Name / company name
Address
VAT number (if reverse charge may apply)
CIS verification / status note (contractor jobs)

SITE
Property / plot / block address
PO / order / application number
Week-ending or stage dates
System: chemical DPC / physical DPC / tanking / cavity membrane / mixed
Rooms / linear metres / wall heights
Quote / variation references

LINES
Labour — survey credit, strip, injection, tanking, membrane fix, plaster, making good, snag
Materials at direct cost — creams, gels, membranes, channels, slurry, plaster, timber chemicals you bought
Free-issue or client-supplied materials — note only, not your materials charge
Deposit / stage credits
VAT (or reverse-charge wording)
CIS deduction (contractor jobs only)
Amount due

PAYMENT
Bank details / Stripe payment link
Terms and retention (if any)

For CIS contractor invoices, show labour and materials separately so the deduction is calculated on the right base. Materials are at your direct cost with evidence — see the labour versus materials section and HMRC’s CIS materials guidance (CISR15060).

Sole trader versus limited company

The invoice entity must match who is contracting and getting paid.

If you trade as a limited company but quote on a personal email as “Dave’s Damp”, put the company’s legal name on the invoice. QS and payroll teams bounce invoices that do not match the purchase order entity.

Labour versus materials for damp-proofing jobs

On CIS jobs, the deduction applies to the labour element. Materials you bought for that contract at direct cost can be excluded from the deduction base when evidenced. Mark-up is not direct-cost material. Free-issue membrane or cream supplied by a main contractor is not your materials line.

Skip hire, tip fees and licensed waste can sit as separate lines when you agreed them that way. Do not bury a skip inside “materials” if you need the CIS materials figure to stay tied to products you actually bought. A guarantee fee paid to an insurance or trade body is not a CIS materials deduction — keep it as its own commercial line or off the CIS materials base.

The practical rule is evidence, not a round-number guess. Creams, membranes, slurry, plaster and pumps you bought for this job can be materials at your direct cost. Labour for strip-out, drilling, injection, tanking, fixing, plastering, making good, snagging and call-outs remains labour. Keep supplier invoices with the job file. See also the public overview of what the Construction Industry Scheme is.

System types to describe clearly

Name the system so the customer and any QS can see what was supplied. The invoice describes the contracted works; it is not automatically a Property Care Association (PCA) guarantee, Building Control certificate or insurance document unless you separately issue those under your terms.

Chemical damp-proof course (injection)

State product family (cream, gel or fluid), walls treated, approximate linear metres, storey and whether plaster removal/re-plaster is included. If injection is a “certain type of damp-proofing treatment” under a contractor payment, treat CIS carefully under CISR14250.

Physical DPC and floor DPM

State where a physical course or membrane was installed, product type and detailing. Floor DPM work as part of altering or repairing a building often sits with other construction operations under CISR14100 when a CIS contractor pays.

Cementitious tanking

State rooms, coats, preparation and whether floor and walls are included. Tanking that waterproofs and alters basement fabric is typically building alteration/repair for CIS when contractor-paid.

Cavity drain membrane systems

State wall and/or floor membrane, drainage channels, sump location and whether the pump is in your package or by others. Describe free-issue components clearly.

Condensation, mould and ventilation adjacency

If the package includes mould wash, extract fans or positive-input ventilation, list those lines separately. Do not imply on the invoice that condensation control is the same as a rising-damp chemical DPC. Cavity wall insulation removal/reinstall, if present, is a different operation — describe it honestly and do not invent energy-saving VAT rates for damp creams (RCB 9/2018).

Deposits and staged payments for multi-room packages

Basement tanking and multi-room DPC packages often need a deposit before materials land on site. Invoice the deposit with its own number. Credit it on later stage or final invoices. Do not leave deposits as undocumented bank transfers.

Free gives five invoices per month. One long damp package can use those five on survey, deposit, injection, plaster and final before any variation appears. Plan choice should account for that document count; do not describe Free as unlimited. See the deposit invoice guide for the deposit document pattern.

Deposits can create VAT tax points when received. If you take money before ordering membrane or specialist creams, raise a numbered deposit invoice and apply the tax treatment for that supply. InvoiceAdept records the invoice; it does not decide the tax point or file the return.

CIS deep-dive: damp-proofing treatments and building alteration

Damp proofing is not “always out” of CIS just because some marketing calls it a specialist treatment. Use HMRC’s manuals carefully.

CISR14250 sits under painting or decorating (FA04/S74(2)(e)) and expressly includes “certain types of damp-proofing treatments” in its Within CIS list. CISR14100 covers construction, alteration, repair, extension, demolition or dismantling of buildings or structures — the natural home for tanking and fabric alteration. Prefer these citations; do not invent extra CISR paragraph numbers.

When you pay other damp gangs or plasterers as a contractor yourself, you may have your own CIS contractor duties. InvoiceAdept can format CIS lines on Pro+, but does not verify subcontractors or file CIS300. See CIS invoice template and related CIS guides on the site.

Householder vs main contractor vs landlord packages

The relationship test sits alongside the operation test. A private householder paying for their own home’s rising damp is not a CIS contractor, so there are no CIS deductions on that domestic invoice — even if you inject a full chemical DPC and tank a basement. Read the public guide: what is the Construction Industry Scheme.

Do not copy CIS wording from a housing-association contractor package onto a householder PDF. Do not omit CIS wording from a contractor basement tanking job because the finished room “looks domestic”.

VAT scenarios for damp proofing

If you are not VAT-registered, do not charge VAT or display a VAT number. The compulsory registration threshold is £90,000 of taxable turnover. The deregistration threshold is £88,000. Read when to register for VAT.

HMRC’s construction VAT manual notes that damp proofing is generally repair or maintenance rather than an “approved alteration” for certain historic relief contexts (VCONST09150). That is a specialist point — ask your accountant before relying on alteration relief language. For day-to-day private homes, assume standard rate unless Notice 708 clearly applies.

New builds, conversions and empty homes

VAT Notice 708 explains when building work can be zero-rated or reduced-rated. Damp-proofing carried out in the course of constructing a qualifying new dwelling can follow the construction rate when the Notice 708 conditions are met. The same caution as other trades applies:

• Zero rating is not automatic because the site is “new build marketing”.

• Services must be in the course of construction of a qualifying building, not a later damp complaint after occupation and sale.

• Apportion mixed sites fairly when some buildings qualify and some do not.

• Do not use damp-cream marketing claims to force a reduced rate that RCB 9/2018 rejects for those products.

If you are unsure whether a particular package is still “in the course of construction”, ask the person responsible for the VAT return before printing 0% or 5% on the invoice. InvoiceAdept will store whichever rate you enter; it does not certify Notice 708 status.

Domestic reverse charge for contractor-paid damp work

When both parties are VAT-registered, the payment is within CIS, and the customer is not an end user, the VAT domestic reverse charge for building and construction services may apply. The invoice then shows reverse-charge wording instead of adding VAT to the amount the contractor pays you.

On the invoice, reverse-charge wording should identify that the customer is to account for VAT, and you should still show the VAT amount the customer must account for where your process requires it — without adding that VAT to the amount they pay you. Match the customer’s VAT number and your own. If only one party is VAT-registered, reverse charge does not apply in the usual domestic construction pattern.

Householder invoices do not use reverse charge. Never reverse-charge a private householder. Survey-only fees that are outside CIS are not reverse-charge candidates under the CIS-linked DRC tests. Contractor-paid chemical DPC, tanking and membrane packages that are within CIS often need the DRC check when both sides are VAT-registered.

Related reading on InvoiceAdept: the domestic reverse charge invoice guide, the CIS invoice template and your accountant’s DRC process. InvoiceAdept formats lines; it does not decide whether reverse charge applies.

Worked examples A–D

Figures are illustrative arithmetic only — not quotes, market rates or advice for a live job.

Example A — domestic chemical DPC for a householder (20% VAT)

VAT-registered damp contractor. Private householder. Chemical DPC cream to ground-floor walls, strip and salt-resistant re-plaster to three rooms. No CIS (householder payer).

Even though this is a full chemical DPC package, there is no CIS block because the customer is a private householder.

Example B — tanking for a main contractor (CIS 20%, reverse charge)

VAT-registered, CIS verified subcontractor. Main contractor pays. Basement cementitious tanking and membrane detailing as alteration/repair of a building — within CIS under CISR14100 when contractor-paid; damp-proofing treatments also sit in CISR14250’s Within CIS list. Both parties VAT-registered; payment within CIS; customer not end user → reverse charge illustration. CIS deduction at 20% (verified).

£3,200 + £2,150 = £5,350; less £640 CIS = £4,710. Free-issue membrane would be noted, not claimed as materials. Verification status and UTR must appear as your CIS process requires. If unverified, the higher 30% rate can apply; gross payment status is 0% deduction — show the status that HMRC verification actually gave you.

Example C — housing association damp package via contractor (CIS)

Subcontractor to a principal contractor on a multi-property damp and mould remediation works order. Chemical DPC and re-plaster to four flats — within CIS as damp-proofing treatments / building repair when the contractor pays. Illustrative verified 20% deduction. VAT treated as reverse charge for this illustration.

Show property numbers and PO. Do not put the tenant’s name as the CIS customer when the contractor is the payer.

Example D — survey-only fee, no CIS, non-VAT

Non-VAT-registered surveyor-specialist. Householder client. Written rising-damp versus condensation diagnosis only — no injection or tanking on this invoice. No VAT. No CIS lines.

If the same contract later includes installation, re-test CIS and VAT on the works invoices. A pure report fee should not carry invented CIS deduction blocks. If you later inject under a new order, that works invoice follows the householder or contractor rules above.

Quote vs invoice vs variation extras

Keep the commercial story tidy so payments release without argument.

When the customer asks for another room or a cavity membrane upgrade after strip-out has started, raise a variation that references the original quote number. Do not silently enlarge the final invoice and hope nobody notices.

Guarantees, Building Control and what the invoice is not

A damp-proofing invoice records what you supplied and installed under the contract. It is not a PCA certificate, not an insurance-backed guarantee, not a Building Control completion notice, and not proof that condensation will never return. If a guarantee is provided by a third-party scheme, say so in the contract documents and do not imply InvoiceAdept or the invoice PDF is that guarantee.

If a dispute starts about whether damp was rising, penetrating or condensation, stop and get written instruction before extending the package. Extra rooms treated “to keep the peace” without a variation become unpaid labour and confused CIS or VAT lines later.

Retention, snagging and practical completion on contractor packages

Developer, HA and main-contractor damp packages often hold a retention. Treat retention as cash timing, not as a reason to blur labour and materials. See also related retention and deposit guides on InvoiceAdept when you stage cash.

• Show the gross certified amount, retention withheld, and net payable on each application.

• When retention is released, raise a clear retention-release invoice or credit note trail that matches the certificate.

• Snagging that is part of the original contract stays inside the original rates; chargeable call-backs after handover need a new instruction.

• If free-issue membrane arrived damaged, record the delay and any dayworks in writing before you absorb the cost.

Practical completion for VAT “in the course of construction” tests is not the same as your snag list being empty. Damp work months after dwellings are occupied is much harder to defend as zero-rated construction of a qualifying dwelling than membranes installed while the structure is still being built. Keep dates on every stage invoice.

Mistakes that bounce damp-proofing invoices

Late payment and retention

The Late Payment of Commercial Debts (Interest) Act 1998 is a B2B regime, not an automatic right against private householders. For qualifying commercial debts, statutory interest is Bank Rate plus eight percentage points. Bank Rate was held at 3.75% on 30 July 2026, so the rate is 11.75% a year until the relevant rate changes. Fixed compensation bands are £40, £70 or £100 according to the debt size.

Do not paste those commercial words onto a consumer damp-proofing invoice. Use fair consumer terms agreed before work, a clear due date and proportionate reminders. For B2B invoices, check whether the contract supplies a different substantial remedy before asserting the statutory route.

Retention on contractor packages is a contract term, not a tax rule. If 5% is held to practical completion or end of defects, show retention withheld and retention released on separate clear lines so cash collected matches the certificate.

Making Tax Digital means records, not filing

InvoiceAdept creates and stores invoice records. It does not file VAT returns, CIS300, MTD updates or Self Assessment to HMRC. It does not decide whether damp work is zero-, reduced- or standard-rated. It does not submit Building Control notices or issue PCA guarantees.

MTD for Income Tax Self Assessment phases in by turnover: over £50,000 from 6 April 2026; £30,000 from April 2027; £20,000 from April 2028. InvoiceAdept keeps records; it does not submit quarterly updates.

How InvoiceAdept helps damp-proofing contractors

InvoiceAdept helps turn a quote and stage history into readable invoices without claiming to be HMRC software or a guarantee platform.

You can separate survey, strip, injection, tanking, membrane, plaster, materials, deposits and variations; send the PDF; and offer Stripe payment where enabled. InvoiceAdept adds no platform fee to Stripe, though Stripe’s own fees apply (UK cards 1.5%+20p; international 2.5%+20p). See pricing, CIS invoice features and start from the invoice generator. Compare also InvoiceAdept vs InvoiceFree if you are choosing a simple UK invoicing tool.

FAQ

Does damp proofing come under CIS?

Often yes when a CIS contractor pays you. CISR14250 lists certain types of damp-proofing treatments as within CIS. Tanking, chemical DPC injection into walls and membrane installation that alter or repair a building typically also sit under CISR14100 (construction/alteration/repair of buildings). A private householder paying you directly is not a CIS contractor.

Does a householder deduct CIS from a damp-proofing contractor?

No. A private householder is not a CIS contractor. Domestic damp invoices should not carry CIS deduction blocks.

Is chemical DPC injection within CIS for contractor jobs?

Treat it carefully as a damp-proofing treatment / building alteration. CISR14250’s Within CIS list includes certain damp-proofing treatments; injection into walls as part of repairing a building also aligns with CISR14100 when a contractor pays. Split labour and materials; show UTR and verification as your process requires.

What about tanking and cavity drain membranes?

Usually within CIS when a CIS contractor pays, as alteration or repair of a building or structure (CISR14100). Describe system, rooms and free-issue components clearly.

What if I only spray insecticidal wood treatment?

CISR14250 excludes pesticide spraying including insecticidal or pesticidal wood treatment from CIS when that is the relevant operation. Do not copy chemical-DPC CIS wording onto a pesticide-only invoice. Mixed contracts that also include construction operations need careful reading of the mixed-contract rules.

What can I treat as materials for CIS on a damp job?

The direct cost of materials you paid for on that contract, supported by evidence — creams, gels, membranes, slurry, plaster, channels, pumps you bought (CISR15060). Mark-up is not direct-cost material. Free-issue materials are not your materials. Guarantee premiums are not CIS materials.

What VAT rate applies to rising damp work at an existing home?

If you are VAT-registered, usually 20%. Do not assume a reduced rate because products are marketed as waterproofing or insulation — RCB 9/2018 says damp-proofing paints, creams and gels are not energy-saving materials.

Can damp proofing on a new build be zero-rated?

Possibly, when it is supplied in the course of constructing a qualifying dwelling and Notice 708 conditions are met. Do not overclaim after practical completion or on a later occupied-home call-back.

When does reverse charge apply to damp-proofing invoices?

When the domestic reverse charge tests are met: both parties VAT-registered, the supply is construction services reported within CIS, and the customer is not an end user. Never reverse-charge a householder. See the GOV.UK reverse charge guidance and InvoiceAdept’s DRC invoice guide.

Should I invoice a deposit before ordering membrane or specialist cream?

If your terms require a deposit, yes — raise a numbered deposit invoice, then credit it on stage or final invoices. See the deposit invoice template.

How should I invoice an extra room or upgraded cavity system?

As a written variation referencing the original quote, not as a silent increase on the final total.

Does InvoiceAdept file CIS, VAT or MTD returns, or issue PCA / Building Control certificates?

No. It creates and stores invoices. CIS features are on Pro+ at £12.99 excl VAT; Pro is £7.99 excl VAT with WhatsApp send; Free is five invoices per month (not unlimited). It does not file CIS300, VAT returns, MTD updates or Self Assessment and does not decide tax status. It does not issue Building Control certificates or PCA/insurance guarantees.

Related guides

• Builder invoice template UK

• Plasterer invoice template UK

• Groundworker invoice template UK

• Deposit invoice template UK

• Retention payments (construction UK)

• Domestic reverse charge invoice UK

• How to invoice a UK client as a tradesperson

• InvoiceAdept vs InvoiceFree

• CIS invoice template UK

• CISR14250 — painting or decorating (incl. certain damp-proofing treatments)

• CISR14100 — buildings and structures

• What is the Construction Industry Scheme

• VAT Notice 708 — buildings and construction

• VAT domestic reverse charge

• Revenue and Customs Brief 9 (2018) — damp proofing products

About this guide

Last reviewed: 4 September 2026. Written for UK damp-proofing, rising-damp and tanking contractors who invoice householders, landlords, builders and housing clients. Sources checked for this revision include CISR14250 (certain damp-proofing treatments within CIS), CISR14100 (buildings and structures), CISR15060 (materials at direct cost), the public CIS guide, VAT Notice 708, Revenue and Customs Brief 9 (2018) on damp-proofing products, VCONST09150, the VAT domestic reverse charge guidance, and GOV.UK invoicing particulars. General information only — not tax, legal, surveying, Building Regulations or guarantee advice. Rules change; confirm live GOV.UK pages and your accountant before relying on a rate or CIS position for a live job.

InvoiceAdept is invoicing software from Tech Me Today Ltd, Companies House 15917255, ICO ZB944663. Start with the invoice generator or compare pricing. Free: five invoices/month. Pro: £7.99 excl VAT. Pro+: £12.99 excl VAT with CIS. WhatsApp send on Pro. No InvoiceAdept platform fee on Stripe; Stripe’s own fees apply (UK cards 1.5%+20p; international 2.5%+20p).

Bottom line

If you install chemical DPC, tanking or membranes for UK householders and contractors, number every deposit and stage, name the system and rooms, apply CISR14250 and CISR14100 honestly when a contractor pays, and never treat a private householder as a CIS contractor. Use InvoiceAdept Free (£0, five invoices/month) to try the workflow, Pro (£7.99 excl VAT) for WhatsApp send, or Pro+ (£12.99 excl VAT) when you need CIS invoice lines — then keep the records your accountant actually needs, without pretending software files HMRC returns or issues PCA guarantees for you.