Too early for GAAP? Only if you want to devalue your business.

In most early stage businesses, the focus is on cash flow and growth. Bookkeeping and choice of accounting methods is many times left to whoever is sending the invoices and paying the bills. And the method tends to be whichever is easiest and least expensive. Since you have to file taxes and for most early stage companies, taxes are done on a cash basis, then the company books tend to remain that way. What you save in bookkeeping costs may really cost you in the end.