If you need to make a financial complaint in the UK, the correct route depends on whether the problem concerns a bank, insurer, lender, payment provider or another regulated firm. This guide explains how to complain, what deadlines to track, when the Financial Ombudsman Service may help, and which alternatives to consider if the complaint is rejected or delayed.
Overview
Start by complaining directly to the business involved. A clear internal complaint gives the firm an opportunity to investigate, correct an error and offer redress. It also creates the record usually needed before an eligible dispute can be referred to the Financial Ombudsman Service (FOS).
Send the complaint through the firm’s stated complaints channel, such as its secure message service, email, post or telephone process. If you complain by phone, keep a note of the date, time, adviser’s name, reference number and what was agreed. Written communication is usually easier to evidence.
Do not assume that every financial dispute belongs with the FOS. The service’s jurisdiction depends on the business, product, complainant and nature of the dispute. A regulator may investigate wider conduct but will not normally decide your individual compensation claim. A court claim, a chargeback request, a Section 75 claim or an insolvency compensation scheme may be more appropriate in some cases.
| Dispute type | Internal complaint | Final-response timing | Possible escalation | What to check |
|---|---|---|---|---|
| Bank account, card or payment service | Complain to the provider’s complaints team | Often subject to a shorter or product-specific period; do not assume the standard timetable applies | FOS, card dispute process, chargeback or court where suitable | Payment-service rules, eligibility and referral deadline |
| Loan, credit agreement or finance | Complain to the lender, broker or finance provider | Usually governed by the firm’s applicable complaint rules; check the final-response date | FOS, court, or specialist debt and credit guidance | Whether the firm and activity fall within FOS jurisdiction |
| Insurance or insurance intermediary | Complain to the insurer, broker or administrator | Often follows the general financial complaint timetable, with possible product-specific exceptions | FOS, claim review, legal advice or court | Policy wording, exclusions, claim evidence and referral limits |
| Investment, pension or financial advice | Complain to the adviser, provider or platform | Check the firm’s acknowledgement and final-response dates carefully | FOS, a relevant compensation scheme, regulator information or court | Product jurisdiction, loss calculation and scheme eligibility |
Complaint rules, FOS compensation limits and referral periods can change and may differ by product. Before escalating, check the firm’s final response, the current FOS guidance and any applicable regulator or scheme information. Treat the dates in this article as a tracking framework rather than a substitute for those rules.
What to track
Create a simple complaint log as soon as the problem arises. Record the firm’s name, trading name, product, account or policy reference, date of the disputed event and the outcome you want. Separate confirmed facts from assumptions or opinions.
Your evidence may include statements, policy documents, loan agreements, screenshots, transaction records, call notes, emails, letters, recordings where lawfully obtained, and proof of financial loss. Keep original files and submit copies. A short chronology is often more useful than a large, unorganised attachment bundle.
Track these dates:
- when you first reported the problem;
- when the firm acknowledged the complaint;
- any promised investigation or response date;
- the date a final response was issued;
- the deadline stated for referring the matter to the FOS; and
- any limitation or court deadline that could affect a separate legal claim.
Use a calendar reminder rather than relying on memory. A final response is not necessarily an admission that the firm is right; it is the firm’s formal position and may explain how to escalate.
Cadence and checkpoints
At the start, send a focused complaint letter. Explain what happened, why you believe the firm acted incorrectly or unfairly, the financial or practical impact, and the remedy requested. Ask the firm to treat the message as a formal complaint where appropriate.
After sending it, check for acknowledgement and preserve the complaint reference. If the firm asks for more information, respond promptly but keep a copy of everything supplied. If progress stops, send a polite written chase referring to the original date and asking when a final response is expected.
Once a final response arrives, read the reasoning, outcome, proposed redress and escalation instructions. Compare the response with your evidence rather than replying immediately in frustration. If the decision is unsatisfactory, check whether you can refer the matter to the FOS and note its current time limit. The FOS process is separate from a court claim, so obtain guidance before allowing a potential court deadline to pass.
For a reusable complaint letter structure, see the UK complaint letter template toolkit. For general escalation planning, the complaint escalation checklist can help organise evidence and dates.
How to interpret changes
A delayed reply does not automatically mean that you have won, and a rejected complaint does not necessarily end the matter. Look for the specific reason given. The firm may dispute the facts, rely on a contract term, say that another business is responsible, question the amount claimed, or argue that the complaint is outside its rules.
Check whether the response addresses each issue. If it ignores a transaction, policy term or documented loss, identify that omission in a short follow-up. Avoid changing your account of events unless you are correcting a genuine mistake; unexplained changes can make the chronology harder to assess.
Consider the remedy separately from responsibility. Possible outcomes may include correcting a record, refunding a charge, reconsidering a claim, paying interest or compensation for a proven loss, or providing an explanation. The FOS may have its own limits and approach to redress, so do not describe a particular amount as guaranteed.
When to revisit
Revisit this guide whenever you begin a new financial complaint, receive a final response, or discover that a deadline is approaching. A quarterly check of your complaint log is useful for unresolved cases, especially where the firm has promised a future review or payment.
Editors should review this article at least annually and whenever the FCA, FOS or a relevant compensation scheme changes complaint rules, jurisdiction, referral deadlines or redress limits. Readers should verify those details at the point of action because product-specific exceptions matter.
Before escalating, complete this short checklist:
- Identify the correct firm and product.
- Send a concise internal complaint and keep proof of delivery.
- Build a dated chronology and evidence file.
- Record the expected final-response date and any follow-up reminders.
- Read the final response and check FOS eligibility and referral timing.
- Consider chargeback, Section 75, a compensation scheme, regulatory information or court action where relevant.
- Get independent legal advice if the loss is substantial, the facts are complex or a court limitation deadline may apply.
For possible court escalation, read the Letter Before Action UK guide, and use the UK legal time limits checklist before relying on a complaint process to protect a legal claim.
