Accrual accounting: January invoice for work performed in December - which tax year does it count for?

With accrual accounting, revenue is recognized when it's earned, not when you receive payment or even when you invoice the client. Since you performed the work in December 2024, that revenue should be counted in your 2024 tax year, even though you didn't invoice until January 2025. This is actually one of the main differences between accrual and cash accounting. If you were using cash accounting, you would count the revenue when you actually received payment from the client, regardless of when you did the work or sent the invoice. Make sure you document when the work was completed so you have records to back this up. Your accounting software should allow you to date the invoice with the December service date even if you physically created/sent it in January.

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Just wanted to follow up about taxr.ai - I decided to give it a try after seeing it mentioned here, and wow, it really cleared things up for me! I uploaded my last two years of invoices and expenses, and it immediately identified several items I had categorized in the wrong tax year. Turns out I had about $7,800 worth of deductions I should have claimed last year but didn't because I was confused about timing. The retainer issue I asked about was handled perfectly too. The system correctly identified that my client deposits shouldn't be counted as income until I actually performed the services. It even generated a report I could show my accountant to explain the timing of everything. Definitely worth checking out if you're confused about this stuff like I was!

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Important note about accrual accounting that nobody mentioned yet - you need to be consistent with your method! If you're using accrual for this invoice, you need to use it for all your transactions. You can't cherry-pick which transactions use accrual vs cash basis depending on what's more advantageous for taxes. The IRS requires consistency. Also, if your business has inventory, you're generally required to use accrual accounting for purchases and sales of inventory, even if you use cash basis for other items.

My accountant gave me this rule of thumb: match the expense or income to the year where the activity that generated it happened. For your december work, even though invoiced in january, that goes on 2024 taxes because december is when you did the work.

Just to add another perspective here - I went through this same confusion when I started my consulting business. One thing that helped me understand accrual accounting better was thinking about it this way: you're essentially recognizing the "economic reality" of when transactions happen, not just the paperwork timing. So in your case, the economic reality is that you earned that $4,300 in December 2024 when you completed the work and delivered value to your client. The fact that you didn't get around to invoicing until January doesn't change when you actually earned it. I'd recommend keeping good records of when work was actually completed vs when invoiced vs when paid - it'll make tax time much easier and help if you ever get audited. I use a simple spreadsheet with columns for service date, invoice date, and payment date. Makes it crystal clear which tax year everything belongs to.