Is It an Accounting Policy or an Estimate?

Is It an Accounting Policy or an Estimate?

If you’ve ever worked on a set of financial statements, you’ll know this moment — you’re halfway through a schedule and suddenly someone asks:

“Wait… is this an accounting policy or an estimate?”

And that’s when the room goes quiet.

It sounds like a technicality, but under IPSAS 3/IAS 8 (Accounting Policies, Changes in Accounting Estimates and Errors), this distinction can determine whether you restate prior years, adjust next year’s figures, or explain yourself to the auditors over a long cup of coffee.

Let’s break it down in plain language.

 The Accounting Policy: Your Rulebook

Think of accounting policy as your organisation’s rule of the game.

It’s about principles — the methods and bases you consistently apply to recognise and measure transactions.

For example:

• You decide to measure Property, Plant and Equipment (PPE) using the revaluation model instead of the cost model — that’s an accounting policy choice.
• You decide to capitalise borrowing costs on qualifying assets — another policy.
• You choose to measure investments at fair value through surplus or deficit — that’s your policy.

Once chosen, policies are applied consistently and retrospectively. Changing them isn’t a small thing — it’s like changing the rules halfway through the game. You need justification, disclosure, and sometimes prior-year adjustments.

The Accounting Estimate: Your Best Judgement

Now, let’s talk about estimates — these are your best guesses about uncertain future events.

They’re about judgement and experience, not about changing the rulebook.

For example:

• You estimate the useful life of a company car as 5 years. Next year, you realise it’s holding up better than expected, so you extend it to 7 years — that’s a change in estimate.
• You adjust your expected credit loss (ECL) model because customers are taking longer to pay — another change in estimate.
• You revise the fair value of investment property based on updated market data — again, an estimate.

Estimates are applied prospectively — meaning from now onwards — because they reflect updated conditions or information.

Let’s Bring It to Life

Imagine this scenario:

Your organisation runs a training institute. You’ve got laptops for your accounting students.

• Your policy says:

“ICT equipment is depreciated on a straight-line basis over its useful life.”

• Your estimate says:

“The useful life of laptops is 3 years.”

If you decide next year to start using reducing balance depreciation, that’s a change in policy.
But if you still use straight-line and just change the life from 3 to 4 years, that’s a change in estimate.

Same laptops. Different story.

Side-by-Side

Feature	Accounting Policy	Accounting Estimate
Meaning	Rule or principle on how transactions are accounted for	Judgement or assumption applied when using a policy
Examples	Using revaluation model for PPE, fair value for financial instruments	Useful lives, residual values, bad debt provisions
Change Type	Fundamental shift in approach	Adjustment due to new information
Application	Retrospective	Prospective
Disclosure	Needs detailed note and justification	Mention in notes if material

Why It Matters

When you confuse an estimate for a policy, you risk misreporting your financials.
Policies define consistency — estimates reflect real-world change.

IPSAS 3 draws the line clearly:

A change in accounting policy changes the foundation; a change in accounting estimate updates the picture.

✍🏽 Final Thought

Accounting is a blend of science and judgment. Policies give us structure — estimates give us flexibility.
Both are necessary: one keeps us consistent, the other keeps us realistic.

So next time you’re staring at a spreadsheet wondering if it’s a policy or an estimate — ask yourself:

“Am I changing the rules or just updating my assumptions?”

Get that right, and you’ll save yourself hours of explaining to both auditors and your boss.