How did you arrive at your own number? If you don't depreciate assets (Rental Property? Business Property? Some other kind of asset?) using the available IRS methods, you'll be literally screaming at the IRS to audit you.
By default, the TTX program uses the most common method for an asset. But if you want to use some other IRS method you can, by selecting the "Other Asset Type" and going from there. Note that if you do an over-ride two things will happen.
1) You will not be able to e-file your return. You'll have to print, sign and mail it to the IRS.
2) You will automatically invalidate the TurboTax 100% Accuracy Guarantee.
