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The tax return should disclose all your wife's taxable income including her regular salary. If she incurs expenses in her self-employment, they can be claimed in the tax return.If the tax return is completed online, the HMRC computer will automatically calculate the tax and NIC. If the return is completed on paper and submitted to the tax office by 31 October 2014, the tax office will issue a paper tax calculation SA302. Either way, HMRC will issue a statement and a payslip which can be used to pay the tax.