Voluntary National Insurance contributions can help fill gaps in your National Insurance record and may increase your State Pension. However, paying does not automatically improve your entitlement, as the outcome depends on your existing record, State Pension forecast, and whether you are likely to build further qualifying years. Class 3 is commonly used, while some self-employed people or those living abroad may qualify for different arrangements. Check your record and forecast on GOV.UK, then contact the Future Pension Centre before paying.