A blank whole-life cost ledger for landing page software

The cost of a landing page tool is the full resource needed to buy, configure, operate and leave it, not the subscription headline. An England-based buyer should start with a dated quote and a blank ledger. There is no market-average figure in this guide.

The method was checked on 6 September 2026. It contains no supplier price, labour rate or assumed return. A named UK accountant, tax adviser, procurement professional and measurement specialist must review the completed worksheet, alongside privacy, security, accessibility and commercial reviewers.

The worksheet is a planning aid, not accounting, tax, investment or procurement advice.

What to take away

Make the quote usable

Copy a supplier amount only when the evidence record has all of these fields: currency, VAT treatment, plan or edition, chargeable unit, quantity, billing period, minimum term, included allowance, overage rule, promotion, renewal condition, legal entity, source date and quote expiry. If one material field is missing, leave the normalised amount blank and ask the supplier.

Public pages can change and may address a different territory. The current Unbounce pricing record and Instapage plans record illustrate supplier-specific plans and units, but neither is used here to create a GBP comparison. The signed order and incorporated documents control the commercial analysis.

Complete the decision header

Fill in these fields before any cost line is entered. Give every amount a named owner and a dated source before entry.

The 2026 Green Book applies within its stated government scope. Its separation of options, risks, costs, benefits and uncertainty can guide other organisations, without implying Treasury endorsement.

Complete the cost ledger

Use separate rows for:

Record each line with unit and quantity, cash amount, internal resource cost, source and date, and confidence.

Confidence scale: A is a dated supplier quote, B is an approved internal rate or recorded quantity, C is a working estimate with a named owner and review date.

Worked through once, without amounts: a quote line for an annual plan becomes a subscription row carrying its chargeable unit, quantity, billing period and renewal condition. The quote's overage rule becomes its own row, with the usage band that triggers it. An onboarding fee becomes an implementation row backed by the external invoice, and staff time to rebuild templates becomes an internal resource row at the approved loaded rate. Anything the quote does not mention, such as export at exit, stays as an open row until the supplier answers.

The NCSC SaaS guidance describes customer responsibilities for understanding, configuring and maintaining an application. Put those buyer-side activities in the budget instead of treating them as absorbed work.

Use blank formulas

Let each variable come from a quote, approved internal rate or recorded quantity:

supplier cost for period = fixed charges + sum of (chargeable unit quantity x unit rate) + add-ons + overages

implementation cost = sum of (resource units by task x approved loaded rate) + external invoices

whole-life economic cost = supplier cost + implementation + operations + assurance + incident and recovery provision + exit

For every line, add source, owner, date, confidence, inclusion and exclusion. State whether an internal rate contains employer costs and overhead. Keep cash payments separate from the economic value of staff time.

VAT needs its own column. GOV.UK's charging and recording VAT guidance explains that VAT-registered sellers must use the correct rate and show VAT information separately on invoices. A software purchase from abroad may raise the reverse-charge questions in HMRC's services-from-abroad guidance. A qualified adviser must determine the actual buyer's registration, recovery and accounting treatment.

Test the vulnerable inputs

Ask what happens if users, domains, traffic or integration usage change; implementation takes more resource; a promotion ends; exchange rates move; or an incident requires external help. Use owner-approved low, working and high cases, clearly labelled as planning scenarios.

Set a budget tolerance and a pause owner. Reforecast when the quote, plan, term, workflow, data map or supplier changes. Add reforecast triggers for supplier terms, implementation tolerance, data maps and incidents. Stop if a critical accessibility, privacy, security or exit requirement fails, even when the total remains within budget.

The useful output is a traceable decision with unresolved fields visible, not a precise-looking number assembled from guesses.

After implementation, reconcile the ledger against invoices, recorded staff units and actual supplier usage definitions. Preserve forecast, committed and actual values in separate columns. A variance should carry an explanation and owner, rather than being overwritten by the newest total. This gives procurement evidence for the renewal decision and shows finance which assumptions were wrong.

Before you act

Common questions

What evidence fields must a supplier quote have before I use its amount?

The quote needs currency, VAT treatment, plan or edition, chargeable unit, quantity, billing period, minimum term, included allowance, overage rule, promotion, renewal condition, legal entity, source date and quote expiry. If any material field is missing, leave the normalised amount blank and ask the supplier.

How should I handle VAT in the cost ledger?

VAT needs its own column. VAT-registered sellers must use the correct rate and show VAT separately on invoices. A software purchase from abroad may raise reverse-charge questions. A qualified adviser must determine the actual buyer's registration, recovery and accounting treatment.

What should I do after implementation to keep the ledger accurate?

Reconcile the ledger against invoices, recorded staff units and actual supplier usage definitions. Preserve forecast, committed and actual values in separate columns. A variance should carry an explanation and owner, rather than being overwritten by the newest total.