My first question would be, what is creating deferred taxes?
Let's say it's coming primarily from differences between book and tax depreciation. If fixed asset levels are expected to remain fairly stable, ie replacement of fully depreciated assets but no real net new increase, then keeping deferred taxes level will probably not materially misstate them. If PP&E are going up, then your deferred taxes are likely to increase too, and you might be able to get away with a growth rate that mirrors fixed asset growth.
I can't gve much guidance beyond this without knowing the approach that you're uisng to calculate all of the other numbers. I'm assuming that you are also projecting an abbreviated income statement for each period forecast so that you can project retained earnings. This would mean that you are forecasting income tax expense. The offset to that entry is going to be split between income taxes payable (short term payables) and deferred taxes. So as long as you make sure that the net affect on ST payables (portion related to taxes) plus change in deferred taxes equals tax expense, your balance sheet will balance. If you put more into current liabilities than into deferred its being a bit more conservative since it lowers working capital and liquidity ratios.
Hope this helps.