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HP / Finance Agreement Calculator
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Accounting standard: FRS 102  ·  Interest method: Effective Interest (IRR)  ·  All figures ex-VAT unless stated
Reconciliation must still pass before results unlock.
1
Agreement Setup
Standard, client, and the headline figures taken from the lender’s agreement
Amount of Credit — take this directly from the lender’s agreement. It is usually labelled “Amount of Credit”, “Balance Financed” or “Amount Financed”. Do not calculate it yourself from the cash price.

Option to Purchase — the final fee payable to take title to the asset. It is capital, not interest: it is added to the final month’s cash flow and repays the remaining liability, so it does not increase the total charge for credit. Many lenders exclude it from their stated Total Amount Payable — the reconciliation in Step 4 handles that.

Enter it exclusive of VAT. Lenders often quote the option fee gross, so a “£100 option fee” may be £83.33 plus VAT. Check which basis the document is on before entering it.

Why VAT is outside the schedule. The schedule models the HP liability, not the bank account. VAT on an HP agreement is charged in full at inception on the cash price and recovered as input tax on that period’s return — it is a movement through the VAT control account, not a cost, and never part of the finance charge. Interest itself is exempt, so it never carries VAT. Putting recoverable VAT into the cash flows would inflate the effective rate against a liability that does not include it, and the schedule would not agree to the HP Liability account in Xero.

The one exception is VAT the lender has financed. Where the lender pays the VAT and adds it to the balance, it sits inside the Amount of Credit and its repayment — usually a lump in month 3 or 4, once the client has reclaimed it — is one of the scheduled payments. It is then genuinely part of the liability and belongs in the IRR. The test is not whether VAT was involved but whether the lender financed it: take the Amount of Credit exactly as stated and enter the payment schedule exactly as written, and the treatment follows automatically.
FRS 102 mode: The calculator derives the implicit interest rate (IRR) using Newton-Raphson and builds the full amortisation schedule using the effective interest method (FRS 102 s20). The documentation fee stays in the payment stream and is absorbed into the effective rate, spreading across the term as finance charge. VAT and advance rental reduce the amount financed; part exchange reduces it as a deposit equivalent. A prepayment in a later month reduces the outstanding balance — the IRR is fixed at inception, but future interest charges fall as the balance drops, shortening the agreement.
2
Payment Schedule
Choose how the lender’s schedule is structured, then enter the payments
Equal instalments — every payment is the same amount, with no gaps. The most common profile. Enter one amount and the term.

Payment groups — the instalment changes during the term, or the first payment differs from the rest. Typical causes: the lender has embedded the documentation fee in Month 1, or the agreement has a stepped or seasonal profile. Enter each block with its commencement date and payment count.

Full schedule — no repeating pattern at all, or you are reconstructing a part-completed agreement. Enter every month individually.

If you are unsure: compare the first payment on the lender’s schedule with the second. If they differ, use payment groups.
All months same amount. Use Payment Groups for agreements with irregular payments, balloons, or different first/last payments.
3
Reference Figures
From the lender’s document — for reconciliation and disclosure only
These figures do not affect the calculation. They are recorded for reconciliation and disclosure only. Only the Amount of Credit drives the interest calculation — the lender has already netted the deposit, part exchange and advance rental off in arriving at it, so deducting them again would understate the balance being financed.
Documentation fee — FRS 102. Enter the lender’s payment schedule exactly as written. If the fee appears as a payment — whether as a standalone first payment or embedded in an inflated first instalment — it goes in as a payment. Do not strip it out.

Where the fee is a payment, the opening liability is the Amount of Credit. The effective rate absorbs the fee and releases it across the term through the Interest column of the amortisation schedule. Nothing is expensed on day one and no Day 1 journal is required.

Where every payment is the same figure, the fee was paid at inception and is not in the schedule at all. It is then a transaction cost, so the opening liability is the Amount of Credit less the fee, and the Day 1 tab will tell you to code the fee payment to HP Liability rather than to expense. Either way the fee reaches the P&L through the effective rate, never as a day one cost.

The liability clearing to nil at the end of the term is your check that it is right.
4
Reconciliation
Check the calculator against the lender’s stated figures before going any further
Green — agrees to the lender’s stated figure exactly.
Amber — agrees on an alternative basis. Almost always because the lender excludes the documentation fee, the option to purchase, or both, from their stated Total Amount Payable. The panel names which basis matched. Amber is acceptable — check the named basis matches the agreement in front of you, then continue.
Red — does not reconcile on any basis. Results stay locked. Re-check the Amount of Credit and the payment profile first; those two fields cause almost every red.
5
Results
Schedule, journals, year-end summary and save to ClickUp
Annual service or admin fees (commonly £40 a year) are not part of the finance cost. Leave them out of the payment schedule entirely and expense them as incurred — including them inflates the EIR.
Early Settlement
Enter the month number and the settlement figure from the lender's settlement letter. The calculator will derive the carrying value at that date, post the settlement journal, and flag the difference as a finance charge adjustment. Asset disposal is handled separately in Xero Fixed Asset Register.

Enter agreement details above

The amortisation schedule, journals and year-end summary will appear here once you enter the financed amount and monthly payment.

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HP / Finance Agreement Calculator  ·  v1.30  ·  27 August 2026  ·  Crown Payroll Services Ltd — internal use only