Affordability checks decide whether a customer can safely take on a buy now pay later instalment plan, and getting the sums right in 2026 protects your business from defaults just as much as it protects the customer from debt they can't manage. The check works out disposable income after essential outgoings and existing credit commitments, then compares that figure against the size and length of the instalment plan being requested.
The headline number retailers usually ask about — the credit limit a customer can be approved for — isn't a fixed figure. It moves with income type, existing debt, and how many months the instalments run over, which is exactly why a proper calculation method matters more than a single rule of thumb.
- Affordability checks for customer finance weigh income against expenditure and existing debt before any instalment plan is approved.
- A soft credit check pulls credit reference data without affecting the customer's credit score.
- FCA rules under CONC 5.2A require a reasonable affordability assessment on every consumer credit agreement in 2026, including BNPL.
- Most declines come down to insufficient disposable income, not a poor credit history.
- Retailers with clear affordability thresholds see fewer missed repayments and fewer failed collections.
Why this matters
Getting affordability checks wrong cuts both ways. Approve too loosely and you're chasing missed repayments and refunds; set the bar too high and you decline customers who could have paid comfortably, costing you the sale. PayItMonthly's buy now pay later platform builds the affordability check into the checkout flow so retailers don't have to run manual credit assessments themselves — but understanding how the calculation works still matters if you're choosing a provider or explaining a decline to a customer.
The FCA has treated affordability as a regulatory requirement, not a nice-to-have, since the Consumer Credit Act 1974 first set out lending obligations. That principle now extends to BNPL agreements as the FCA brings the sector under full consumer credit regulation in 2026.
How do you calculate affordability checks for customer finance?
A proper affordability calculation follows a consistent sequence, whether it's run automatically by a finance platform or manually by a merchant's finance team.
- Verify identity and income. Confirm the customer is who they say they are and capture a realistic income figure — payslip data, bank statement analysis, or self-declared income depending on the check type.
- Pull credit reference data. A soft search against one or more credit reference agencies flags existing debt, missed payments, and open credit lines without leaving a mark on the customer's file.
- Estimate essential expenditure. Rent or mortgage, utilities, existing loan repayments, and other fixed costs get deducted from income to reach disposable income.
- Compare disposable income to the instalment amount. The monthly instalment being requested needs to sit comfortably within what's left over, with room for unexpected costs.
- Apply a decision. Approve, decline, or offer a reduced credit limit based on the outcome — this is also where vetting customers for buy now pay later eligibility becomes a repeatable process rather than a judgement call.
Most BNPL schemes structure the actual repayment into equal instalments over a fixed term, which keeps the affordability sums simpler than a multi-year loan — the monthly amount is fixed and known upfront, rather than fluctuating with interest.
Soft credit checks vs hard credit checks
The method used to pull credit data changes what the customer sees on their credit file and how fast the decision comes back.
| Check type | What it does | Effect on customer credit score |
|---|---|---|
| Soft credit check | Reviews credit reference data instantly at checkout | No visible mark, invisible to other lenders |
| Hard credit check | Full credit search, often used for larger credit lines | Visible on file, can affect future applications |
| Open banking check | Reads live bank transaction data with customer consent | No credit file impact, more accurate income picture |
A soft credit check paired with expenditure data gives the fastest, least invasive affordability read for retail-sized instalment plans — which is why most point-of-sale BNPL checkout flows default to it. Merchants weighing up offering no credit check finance responsibly should treat no credit check and no affordability check as two different things: skipping the credit search does not remove the FCA's requirement to assess affordability.
Why affordability checks vary from customer to customer
- Income type — self-employed and gig-economy income is harder to verify than salaried income, so checks often ask for more documentation.
- Size of the purchase — a higher instalment amount needs a wider affordability margin before approval.
- Existing credit commitments — customers already juggling several BNPL agreements or loans get flagged for closer review.
- Repayment term length — a plan spread over more months lowers the monthly instalment but extends the exposure window, which some checks weight differently.
- Regulatory requirements — FCA CONC 5.2A sets the standard for a reasonable assessment, and that standard tightens as BNPL regulation takes full effect in 2026.
- Merchant risk appetite — some retailers set tighter internal thresholds than the platform's default, particularly on high-ticket items.
Do affordability checks affect a customer's credit score?
A soft credit check, the type most BNPL affordability assessments use, does not affect a customer's credit score and isn't visible to other lenders. A hard credit check, used less often for point-of-sale finance, leaves a visible search on the credit file that other lenders can see when the customer applies elsewhere.
What happens if a customer fails an affordability check?
A failed affordability check usually results in a decline or a reduced credit limit rather than a blanket rejection — the customer is typically offered a smaller instalment amount or a shorter term instead. Retailers seeing a high proportion of failed checks should look at reducing declined finance applications at checkout, since the fix is often about matching the finance offer to the basket size rather than the check itself being too strict.
Is affordability checking a legal requirement for BNPL in the UK?
Yes, affordability checking is a legal requirement once BNPL agreements fall under FCA consumer credit regulation, which takes effect in 2026. Before that, many BNPL providers ran affordability checks voluntarily under CONC 5.2A principles, but the 2026 regime makes the assessment mandatory rather than best practice.
Add BNPL affordability checks at checkout
See how the finance option and the eligibility check sit together at your checkout.
FAQ
What is an affordability check in customer finance?
An affordability check assesses whether a customer can comfortably repay an instalment plan by comparing income and expenditure against the size of the credit being offered. It combines credit reference data with expenditure estimates before a lender or retailer approves the plan.
How much disposable income do you need for BNPL approval?
There is no single fixed figure - disposable income needs to comfortably cover the requested instalment plus a margin for unexpected costs. The exact threshold depends on the size of the purchase, the term length, and the provider's own risk criteria.
Does a BNPL affordability check show up on a credit report?
A soft credit check, which most BNPL affordability assessments use, does not show up as a visible search on a credit report. Only a hard credit check leaves a mark other lenders can see.
Is BNPL regulated by the FCA in 2026?
Yes, BNPL agreements come under FCA consumer credit regulation in 2026, making affordability checks a legal requirement rather than a voluntary practice. Providers and retailers offering interest-free instalments need a documented assessment on every application.
Can a customer appeal a failed affordability check?
Most providers allow a customer to reapply with updated income information or accept a reduced credit limit instead of the original request. A decline is not usually permanent - it reflects the information available at the time of the check.
What documents are needed for an affordability check?
Basic checks need identity verification and either payslip data, bank statement access, or self-declared income depending on the check type. Open banking checks need customer consent to read live transaction data instead of documents.
Do self-employed customers face stricter affordability checks?
Self-employed income is harder to verify automatically, so affordability checks for self-employed customers often ask for more supporting documentation. The underlying calculation - income minus expenditure against the instalment size - stays the same.
How long does an affordability check take at checkout?
A soft credit check with automated expenditure estimates typically returns a decision within seconds at checkout. Checks requiring manual document review or open banking consent take longer, usually minutes rather than seconds.
One last thing
The FCA's push to bring BNPL fully under consumer credit regulation in 2026 doesn't change the maths behind an affordability check — it changes who's accountable for running one properly. Retailers who already treat affordability as a checkout feature rather than a compliance afterthought won't need to change much; the ones relying on no-credit-check messaging as a selling point will need to rebuild that process before the rules bite.
