TL;DR
The UK Financial Ombudsman Service is the free independent service for resolving consumer-financial disputes. Complain to the firm first; if unresolved within 8 weeks or rejected, escalate to FOS within 6 months. This guide covers the process.
Key facts
- FOS is free for consumers, no fees.
- Firm has 8 weeks to provide final response under FCA DISP.
- Consumer can escalate to FOS within 6 months of final response.
- FOS decisions binding on firm if consumer accepts.
- Consumer can reject FOS decision and pursue court action.
- Typical award limits GBP 415,000 (rising).
- Most categories covered: banking, mortgages, insurance, investments, credit.
- Online complaints submission at financial-ombudsman.org.uk.
The Financial Ombudsman Service (FOS) is the UK's independent dispute resolution service for consumer-financial complaints. The service is free for consumers and binding on firms if the consumer accepts the FOS's decision. The FOS handles around 200,000 cases a year covering banking, mortgages, insurance, investments, credit, and most other financial product categories.
This guide covers when to use the FOS, the time limits and process, the types of decisions, and the practical points around preparing a complaint.
Complain to the firm first
FOS only handles complaints that have been raised with the firm first and not resolved. The first step is always to complain to the firm through their formal complaints process. Most firms have a dedicated complaints team accessible by phone, email, or written letter.
Under FCA DISP (Dispute Resolution: Complaints) rules, the firm has up to 8 weeks to provide a final response. The final response is a written letter setting out the firm's decision, the reasoning, and any redress offered. The 8 weeks runs from receipt of the formal complaint.
Where the firm provides a final response that resolves the issue (full refund, apology, remediation), the matter ends. Where the firm partially resolves but the consumer is not satisfied, or where the firm refuses, the consumer can escalate to FOS within 6 months of the final response date.
Where the firm fails to provide any final response within 8 weeks, the consumer can escalate to FOS without waiting longer. The 8-week deadline is firm; failures to respond support a FOS referral.
Escalating to FOS
Submit the FOS complaint at financial-ombudsman.org.uk through the online complaint form, or by post or phone. The form captures: complainant details, firm details, nature of the complaint, what has happened, what resolution is sought, copy of the firm's final response (or evidence that 8 weeks have passed with no response).
FOS acknowledges receipt within a few days and assigns the case to an adjudicator. The adjudicator gathers information from both parties and assesses the case against FOS principles and applicable rules. Initial decision typically within 3-6 months for routine cases; longer for complex matters.
Where the adjudicator's view is rejected by either party, the case escalates to an Ombudsman for final decision. The Ombudsman's decision is binding on the firm if the consumer accepts. The consumer can reject and pursue court action with no penalty other than the time lost.
Practical action: keep all correspondence with the firm (emails, letters, call recordings where available) as evidence for the FOS submission. The clearer the timeline and the evidence, the faster the FOS can resolve.
Types of disputes FOS handles
Banking: account errors, unauthorised transactions, fraud disputes, account closures without proper reason, charges and fees disputes, switching service failures, packaged account mis-sales.
Mortgages: misadvice on product selection, affordability assessment failures, application processing errors, arrears and possession handling, interest rate changes, mortgage prisoners' issues.
Insurance: refused claims, unfair claim processing, mis-sold policies, premium increases without notice, cancellation disputes. Specific categories include car, home, life, critical illness, income protection, travel, pet, and specialist insurance.
Investments: unsuitable advice, platform errors, fund performance disputes (where mis-selling or false promises are involved), pension transfer issues, SIPP disputes.
Consumer credit: irresponsible lending, payday loan refunds, credit card disputes, default markers, debt collection issues, Section 75 Consumer Credit Act 1974 claims.
What FOS can and cannot do
FOS can: order refunds of charges, fees and interest; order interest on missed payments; order remediation (correcting credit file markers, restoring account status); order compensation for distress and inconvenience (typically GBP 100-1,000, occasionally more in serious cases); order policy enforcement (claim payment where insurer wrongly refused).
FOS cannot: rule on specific tax decisions (HMRC matters), rule on insurance underwriting decisions about new risks (only on claim handling), order firms to provide specific products, recover funds from third parties (fraud recipients), provide criminal prosecution (Action Fraud handles fraud crime reports).
Award limits: typical maximum award is GBP 415,000 for cases referred since April 2022 (the figure is uprated periodically). Larger losses can still be claimed but require court action rather than FOS.
Worked example: a consumer complains about packaged account mis-selling. The bank charged GBP 17/month for 8 years (GBP 1,632 total) for travel insurance the consumer never used. FOS finds in the consumer's favour. Award: GBP 1,632 refund + 8% simple interest on the period + GBP 200 for distress and inconvenience. Total around GBP 2,500.
Preparing a strong complaint
Structure the complaint clearly: what happened (timeline of events), what was wrong (specific failures by the firm), what damage was caused (financial loss, distress, additional costs), what resolution is sought (refund of GBP X, correction of credit file, etc.).
Evidence: bank statements, contracts, correspondence with the firm, recordings of phone calls (where lawful and available), receipts for additional costs incurred. The clearer and more complete the evidence, the faster the FOS can adjudicate.
Reasonable resolution: ask for what is proportionate and supportable. Excessive demands (large compensation for minor issues) can weaken the case. Reasonable demands (specific refunds, specific corrections, reasonable distress compensation) are more likely to be supported.
Practical action: where the case is complex (substantial value, technical issues, multiple parties), specialist advice may be valuable. Free advice from MoneyHelper or Citizens Advice covers most consumer cases. Legal advice (solicitor or specialist firm) may be needed for very high-value or complex matters; FOS itself does not require legal representation.
Common FOS case categories and outcomes
Banking complaints: account errors (unauthorised transactions, double-debits, missed credits), account closures without proper reason, switching service failures, packaged account mis-sales. The FOS has handled millions of banking complaints across these categories with well-developed decision frameworks.
Mortgage complaints: misadvice on product selection, affordability assessment failures, application processing errors, arrears handling. Mortgage cases are often complex due to long-term contracts and substantial amounts involved. FOS decisions typically focus on what a reasonable lender would have done in the circumstances.
Insurance claim disputes: refused claims, delayed claim processing, claim value disputes. The FOS examines the policy terms, the claim circumstances, and the insurer's handling. Where the insurer's decision was unreasonable or the handling was poor, FOS typically orders the claim payment plus compensation for delay.
Investment complaints: unsuitability of advice, platform errors, fund performance disputes (only where mis-selling is involved), pension transfer failures. Investment cases turn on what a reasonable adviser would have recommended given the client's circumstances. The FOS doesn't substitute its judgement for proper professional advice but examines whether the advice was reasonable.
Free advice or representation
The FOS is free for consumers. Legal representation is not required and rarely beneficial for typical consumer financial cases. Many consumers submit successful complaints themselves through the online form.
Free support during preparation: MoneyHelper, Citizens Advice, and the FOS itself provide guidance on how to structure a complaint. The FOS website has detailed guidance on each complaint category with example case studies.
Avoid claims management companies (CMCs). CMCs take 20-40% of any award as fees, plus may add other charges. The same outcome is achieved through direct FOS submission without the fee. CMCs have a poor reputation in UK financial services and are increasingly regulated to prevent abuse.
Where the case is complex (substantial value, technical legal issues, multiple parties), specialist legal advice may be valuable. Solicitors specialising in financial services typically charge GBP 150-300/hour; for cases with large potential awards the cost can be reasonable. The FOS process itself doesn't require legal representation but complex preparation can benefit.
Disclaimer
This article provides general information based on rules and figures published by UK government and regulator sources as of May 2026. It is not personal financial, legal, immigration or tax advice. Rules, fees and figures change and individual circumstances vary. Readers should check primary sources or consult a qualified, regulated adviser before acting on any information here.
Frequently asked questions
How do I complain to the Financial Ombudsman?
Submit a complaint at financial-ombudsman.org.uk through the online form, or by post or phone. You must have complained to the firm first and either received a final response that didn't resolve the issue, or waited 8 weeks without a response. Submit to FOS within 6 months of the firm's final response. The service is free; no legal representation needed.
How long does a FOS complaint take?
Routine cases typically 3-6 months from submission to initial decision. Complex cases can take 12 months or longer. Where either party rejects the initial decision, escalation to an Ombudsman adds time. The FOS prioritises urgent cases (financial hardship, vulnerable consumers) for faster decision. Volume of cases affects turnaround; busy periods see longer waits.
Is the Financial Ombudsman free?
Yes for consumers. The firm pays a case fee to the FOS for each complaint handled. Consumers can submit complaints themselves through the online form, by post, or by phone. Legal representation is not required and rarely beneficial for typical consumer financial cases. Free advice from MoneyHelper or Citizens Advice can support preparation.
Can I appeal a FOS decision?
Both consumers and firms can reject an adjudicator's initial decision and request escalation to an Ombudsman for final decision. After the Ombudsman's decision, the consumer can accept (making it binding on the firm) or reject. Rejecting the Ombudsman's decision allows the consumer to pursue court action; no penalty other than the time and cost of litigation.
What sort of compensation can FOS award?
Direct losses (refunds of charges, fees, interest), interest on missed payments, remediation (correcting credit file markers), compensation for distress and inconvenience (typically GBP 100-1,000, more in serious cases), and order of policy enforcement (claim payment where insurer wrongly refused). The current award limit is GBP 415,000 per case. Larger losses require court action.