Most accounting software’s allow you to set up categories in the settings, which means as expenses come in, you simply need to assign them to a category. Much easier than trying to remember something 12 months later!
Accounting software such as QuickBooks allow you to take photos of receipts and immediately attach them to the expenses part of your bookkeeping. This means you can also categorize them immediately.
The secret to more painless business bookkeeping is to automate as many functions as you possibly can. This means you should take advantage of features in your accounting software such as the ability to connect bank accounts and credit cards.