Hi. My wife earned investment income and a salary last year. This year, she's now stayed at home with our daughter, and thus hasn't earned a salary - thus significantly less taxable income. For the first provisional tax payment, do I have to use the basic amount (i. E. Last year's taxable income) to calculate this payment? The payment will then end up being more than her annual tax is expected to be, as there is obviously no salary (and no corresponding PAYE). Or can I safely estimate a lower amount for the first payment?