I'm a sole practitioner, and have always used the cash accounting method. In 2019 I did a significant amount of work and advanced a significant amount of cash for clients, but none of it was billed or paid until 2020. It looks like the large write offs in 2019 will only same me low tax bracket amounts, while the related income will cost me high tax bracket amounts in 2020. Can I switch from cash to accrual accounting so that I can count the writeoffs in 2019 against the associated income (which was fully earned in 2019)? If so, is there guidance somewhere online as to how to get the IRS onboard (in their form 3115, which is not supported by TurboTax)?
