YES

As of 13 August 2026, AI can calculate interest from an AER.

Most people should do this themselves; the prompt is on this page.

Can you do it?

2 minutesto a draft.

5 minutesto something you’d act on.

Cost, all in£0

Skill needednone

Who has to check ityou

What the alternative costsNo priced human or software alternative is provided in the supplied tools data.

If this goes wrong, you get an inaccurate estimate and can correct it by checking the inputs, assumptions and bank statement.

What to actually do

  1. Do it yourself

    The route this page recommends

    A chat interface, no skill needed, and roughly 5 minutes until you can act on the result.

    How to actually do it

    1. Open your savings account's current terms or product page and copy the AER, rate-change conditions, interest-crediting frequency, and any balance limits.
    2. Gather the starting balance, calculation dates, and the dates and amounts of every deposit or withdrawal during the period.
    3. Paste those figures and the account wording into the prompt, replacing each bracketed slot and writing none where there were no transactions.
    4. Ask the chatbot to calculate both the unchanged-balance annual estimate and the requested-period result, with the working shown.
    5. Recalculate the basic result with a calculator and compare the assumptions about dates, compounding, rate changes, and balance limits with the account terms.
    6. Compare the final estimate with your bank statement or ask the bank for the exact figure if the account has variable rates, staged rates, or transactions the calculation does not cover.

    Prompt

    Calculate the interest I may earn from this UK savings account. Use only the figures I provide and do not invent any missing information.

AER: [insert AER as a percentage]
Starting balance: [insert pounds and pence]
Calculation period: [insert dates or period]
Deposits during the period: [insert amounts and dates, or none]
Withdrawals during the period: [insert amounts and dates, or none]
Account terms about when interest is credited: [paste the relevant wording]

Show the calculation step by step. Give the full-year estimate if the balance stays unchanged, then calculate the requested period only if the assumptions make that possible. Explain that AER is an annualised rate and identify whether the result is an estimate rather than the bank's exact figure. Flag anything that could change the result, including deposits, withdrawals, interest-crediting dates, rate changes, tax, or account-specific terms. Do not give tax or investment advice. State which figures I should check against my bank statement or account terms.

    Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

  2. Use a tool built for this

    Second choice

  3. Hand it to a person

    The distant third

    A person who owns the outcome does this end to end, worth it when the failure is dear.

What it gets wrong

Even on a YES, the friction has a name: stakes of error and context depth.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

AxisScore (0–2)
Output2
Inputs2
Verification2
Liability1
Effort delta2
Total9 / 10

The methodology and its thresholds are published in full.

FAQ

Can AI work out interest from an AER?
Yes. It can calculate an estimate from the AER, balance and period, and show the arithmetic. Check the result against your account terms because the bank's exact figure can depend on transactions, rate changes and when interest is credited.
How do I calculate interest from an AER?
For an unchanged balance over a full year, multiply the balance by the AER expressed as a decimal. For a shorter period or changing balance, the result needs assumptions about timing and compounding, so use the bank's terms and treat an AI result as an estimate.
Is AER the same as the interest I will get?
No. AER is an annualised comparison rate, while the amount you receive depends on your balance, how long the money stays in the account, and the account's interest-crediting rules. A bank statement or the bank's own calculation is the final check.
Can AI tell me how much interest I will get after tax?
It can help organise figures, but tax treatment depends on your circumstances and the relevant UK rules. This is not professional advice. For a serious tax or savings decision, ask HMRC or a regulated financial adviser.

Nearby answers

All Savings & investing basics rulings

Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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