LeaseKit

FRS 102 Amended 2026 · IFRS 16 · Free

Lease accounting calculators that show their working

Most leases moved onto the balance sheet for UK GAAP periods beginning on or after 1 January 2026. These five calculators do the measurement — liability, right-of-use asset, journals, schedules and disclosure notes — and let you file the workings.

Open the calculators Do this across a whole register
No sign-up Nothing leaves your browser 66 arithmetic tests CSV + print

The calculators

FRS 102 · New lease

FRS 102 lease calculator

Measure a new lease under Section 20 as amended. Liability, right-of-use asset build-up, commencement journal, full amortisation schedule, maturity note — and the table showing how front-loaded the P&L charge becomes.

Open FRS 102 · Transition

FRS 102 transition calculator

Bring an existing operating lease onto the balance sheet at the date of initial application. Both permitted bases for the right-of-use asset, the opening reserves adjustment, the transition journal, and an exemption checker.

Open IFRS 16

IFRS 16 lease liability calculator

The same measurement model for full IFRS reporters, with the IFRS 16.58 maturity disclosure, useful-life handling where it is shorter than the term, and notes on what belongs in the lease payments.

Open Discount rates

Incremental borrowing rate calculator

Build an IBR from a term-matched risk-free rate, credit spread and asset adjustment, with the evidence note attached. Interpolate a yield curve, or solve for the rate implicit in the lease.

Open Provisions

Dilapidations provision calculator

Discount a restoration obligation to present value, capitalise it into the right-of-use asset, and unwind the discount over the term so the provision lands at full cost when the works fall due.

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Why this exists

There is no shortage of lease calculators. There is a shortage of ones that will tell you how they got the number.

A lease liability is a judgement dressed as arithmetic. The present value is trivial to compute; the term, the discount rate and the question of what counts as a lease payment are where the answer actually comes from — and they are what an auditor will ask you to evidence, eighteen months after you stopped remembering. So every calculator here does three things a black box does not:

  • Shows the build-up. The right-of-use asset is presented line by line, not as a single figure. The journal is shown as debits and credits, with a balance check.
  • Exports the inputs with the results. A CSV that contains only answers is not a working paper. Every export carries the assumptions that produced it and the basis of preparation.
  • Publishes its tests. The arithmetic is covered by 66 tests you can read, including textbook annuity checks and proof that every schedule amortises to exactly zero and every journal balances.

What changed under FRS 102

The FRC's 2024 periodic review removed the operating and finance lease distinction for lessees. For accounting periods beginning on or after 1 January 2026 — with early application permitted — most leases are recognised on the balance sheet as a right-of-use asset and a lease liability, broadly aligning UK GAAP with IFRS 16.

For a December year end that means a date of initial application of 1 January 2026, first affected accounts for the year ending 31 December 2026, and audit questions in early 2027. Gross assets and gross liabilities both rise; net assets are unchanged on day one and then diverge as the asset depreciates on a straight line while the liability unwinds on an interest basis. Rent leaves operating costs and reappears as depreciation and interest, which flatters EBITDA and worsens gearing — a combination worth modelling before a covenant test finds it for you.

What these tools will not do

They will not tell you whether your contract contains a lease, what the reasonably certain lease term is once break clauses and renewal options are in play, or what your incremental borrowing rate should be. Those are judgements. Nothing that runs in a browser can make them for you, and any tool that claims to is selling you a liability rather than an asset.

Five calculators will get you through a handful of leases

A register of forty needs something that remembers

AuditLease is lease accounting software for UK preparers and accounting firms: bulk import, group structures and non-calendar period ends, mandatory judgement documentation, an immutable audit trail, statutory disclosure notes, and free read-only access for your auditor. Priced on active leases, not user seats — free for up to three.

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Common questions

Are these really free?

Yes. No sign-up, no limits, and nothing makes you hand over an address to use them. If you want the figures emailed to you there is a form for that, and it asks plainly whether you want anything else from us. They are a genuinely useful thing built by the people behind AuditLease, on the theory that accountants who trust the free calculator are the right people to tell about the paid one.

Is my lease data stored anywhere?

No. The calculators are static files and the maths runs in your browser. Pressing Calculate makes no network request, and nothing is written anywhere except the CSV you choose to download.

Which standard applies to me?

UK entities preparing accounts under UK GAAP apply FRS 102, as amended, for periods beginning on or after 1 January 2026. Entities reporting under full IFRS have applied IFRS 16 since 2019. Small entities applying FRS 105 are outside both — the micro-entity standard was not changed in the same way.

Can I put this output straight into the accounts?

Review it first. The arithmetic is tested and the export carries its own assumptions so it can be filed as a working paper — but the inputs are judgements you made, and they drive the answer far more than the calculation does.

The reasoning behind the numbers

A calculator gives you a figure. These explain the judgements that decide whether the figure is defensible, and how to write them down so they survive review.