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In the UK, can authors split a single advance on a book over multiple tax returns?
HMRC calls it: Averaging for creators of literary or artistic works, and it is the averaging of your profits for 2 successive years. It's helpful in situations like you describe, where income can fluctuate wildly from year to year, the linked article has the full detail, but some of the requirements are: You can use averaging if: you’re self-employed or in a partnership, and the business started   before 6 April 2014 and didn’t end in the 2015 to 2016 tax year  your   profits are wholly or mainly from literary, dramatic, musical or   artistic works or from designs  you or your business partner (if you’re   in a partnership) created the works personally. Additionally: Check that your profit for the poorer year, minus any adjusted amounts, is less than 75% of the figure for your better year. If it is, you can use averaging. Then, check if the difference between your profits for the 2 years is more than 30% of your profit for the better year. If it is, work out the average by adding together the profits for the 2 years, and divide the total by 2.