What happens when I exceed my personal tax allowance (£8105) for this tax year (2013)?

Normally HMRC go back 6 years for a genuine mistake, but if it is considered fraud is involved, they can go back further. It will be up to you to prove you acted in good faith by accepting two personal allowances, and not picking up on it. Maybe one employer did not tell HMRC of your employment, and that is why it was not picked up before.

Your only other hope would be if employer did not fulfil their legal obligations, when debt would come back on employer. Did you sign form P46 when you started second job? If you did, onus is on you.

If you weren't offered one by employer, or didn't sign form, onus could be on employer. I use the term "employer" loosely, pension payers act as employers for tax purposes. I guess your pension is second income, and that it started later than job.

If you are held responsible, it will depend on the level of income as to how it is collected. Normally, if income high enough, underpayment is collected through a restriction in your code number for future tax years. Otherwise, revenue may ask for lump sum, but you can ask for time to pay if your financial circumstances will be reduced.

It all depends on income levels. These circumstances will not come under "official error" where debt can be written, because HMRC was not given information, and you should have been aware that you were not paying enough tax..

Previous answers are incorrect. They seem to be referring to the Statute of Limitations Act, which is indeed 6 years. However, tax evasion, if that's what this is, is not covered by the act.

Neither, in any case, are HMRC who are not time barred in claiming tax.

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