How to Use AI to Compare Loans and Understand Interest

Borrowing money is easy to arrange and surprisingly hard to compare. One loan advertises a low monthly payment, another a low interest rate, a third has an arrangement fee, and a car finance deal mentions a “balloon payment” you’re not quite sure about. The number that really matters, the total amount you’ll repay, is often the one you have to dig for.

AI can explain the jargon, work through the maths and put several offers side by side so you can see the true cost. It can’t tell you which product is right for you or check your credit file, and its sums need checking. For big or complicated borrowing, or if you’re struggling with debt, get free, regulated guidance. This guide takes about 30 minutes.

New to AI? Start with our step-by-step beginner’s guide.

What you’ll need

• The details of each loan or finance offer: amount, APR, interest rate, term, monthly payment, fees, total repayable
• Your monthly budget, so you can check affordability
• The lender’s key information documents (often called pre-contract information)
• An AI chatbot and a spreadsheet or calculator
• About 30 minutes

Step-by-step: compare loans with AI

1. Understand the jargon. Ask the AI to explain APR, representative APR, fixed and variable rates, arrangement fees, early repayment charges, secured and unsecured loans and balloon payments in plain English (prompt 1).
2. Collect the real numbers. Use quotes or eligibility checkers that give you a personal rate where possible. Remember that the advertised representative APR doesn’t have to be the rate you’re offered.
3. Compare like with like. Ask the AI to put the offers in a table with monthly payment, total repayable and total cost of borrowing (prompt 2). A longer term can mean lower monthly payments but much more interest overall.
4. Check the maths. Ask the AI to show its working, then check the totals against the lender’s documents. If they differ, trust the documents and ask the lender why.
5. Test affordability. Ask the AI to compare each monthly payment with your budget and to model what happens if your income drops or, for variable rates, if the rate rises (prompt 3).
6. Consider alternatives. Ask the AI to outline other options, such as saving first, a 0% purchase card used carefully, a credit union loan or borrowing less. Don’t apply for anything just because it’s suggested.
7. Prepare questions for the lender. Ask for a list of questions about fees, early repayment, missed payments and what happens if your circumstances change (prompt 4).

Copy-paste prompts

1. Explain loan jargon

Explain these borrowing terms in plain UK English with a simple example for each: APR, representative APR, interest rate, fixed vs variable rate, arrangement fee, early repayment charge, secured vs unsecured loan, total amount repayable, and balloon payment (in car finance). Keep each explanation under 60 words.

2. Compare my loan offers

Compare these loan offers:
Offer A: borrow [AMOUNT], APR [RATE]%, term [MONTHS], monthly payment [AMOUNT], fees [AMOUNT], total repayable [AMOUNT]
Offer B: [SAME DETAILS]
Offer C: [SAME DETAILS]
Show a table with monthly payment, total repayable, total cost of borrowing (total repayable minus amount borrowed) and any fees. Show your working. Point out the trade-offs, such as lower monthly payments but higher total cost. Don't recommend a provider; tell me what to check.

3. Affordability check

My take-home pay is [AMOUNT] a month and my essential spending is [AMOUNT]. I'm considering a monthly loan payment of [AMOUNT] for [MONTHS] months. How much would I have left each month? Model two scenarios: my income falls by [PERCENT]%, and (if variable) the rate rises by 2 percentage points. Explain the risks in plain English.

4. Questions for the lender

I'm considering a [TYPE OF LOAN OR FINANCE] for [PURPOSE]. Write a list of questions to ask the lender before signing, covering: the exact APR I'll get, all fees, early repayment, missed payment charges, what happens if my circumstances change, whether it's secured, and any insurance or add-ons. Add a short note on my right to withdraw from a credit agreement.

Recommended tools

• Claude: clear, careful explanations of financial terms and trade-offs.
• ChatGPT: good at building comparison tables and showing calculations.
• Gemini in Google Sheets: build a loan comparison sheet with formulas.
• Microsoft Copilot in Excel: the same for Excel users.
• Grok: quick explanations of a term you’ve just come across.
• MoneyHelper and lender eligibility checkers: impartial guides and soft-search tools that show your likelihood of approval.

If you already have several debts, it may help to prepare for a meeting with a financial adviser. Be wary of loan offers that arrive out of the blue, and learn how to spot scam emails and texts. If you’re thinking of borrowing for a big seasonal cost, see how to plan for Christmas and holiday spending instead.

Tips and mistakes to avoid

• Compare total cost, not just monthly payments. A lower payment over a longer term usually costs more.
• Don’t take AI calculations as final. Use the figures in the lender’s pre-contract information.
• Beware of add-ons. Payment protection, insurance or extras can raise the cost. Ask whether they’re optional.
• Use soft searches first. Eligibility checkers typically don’t affect your credit file; full applications leave a mark.
• Don’t borrow to cover essentials or other debts without speaking to a free debt advice service.
• Never share account numbers or credit reports in full with a chatbot. Summaries are enough.
• Read before signing. If you don’t understand a clause, ask the lender to explain it.

FAQ

What’s the difference between APR and interest rate?

The interest rate is what you pay on the money borrowed. APR includes the interest plus compulsory fees, so it’s usually the better figure for comparing similar loans.

Is the advertised rate the one I’ll get?

Not necessarily. A representative APR only has to be offered to a proportion of successful applicants. Your personal rate depends on your circumstances and credit history.

Can AI tell me which loan to choose?

It can help you compare costs and understand risks, but it isn’t a regulated adviser and doesn’t know your full situation. Use it to prepare, then make the decision yourself or with professional guidance.

Explain these borrowing terms in plain UK English with a simple example for each: APR, representative APR, interest rate, fixed vs variable rate, arrangement fee, early repayment charge, secured vs unsecured loan, total amount repayable, and balloon payment (in car finance). Keep each explanation under 60 words.

Related guides

• How to use AI to create a debt payoff plan
• How to use AI to make a monthly budget
• How to use AI to understand official letters and forms

Reference: MoneyHelper: Personal loans