I pay my income tax in the Quellensteuer system, but I received the Steuererklarung forms for 2010. I was in Zurich only for the last 3 months of 2010, which seems to imply that I have an "unterjährigen Steuerpflicht" where the rate of my tax is based on an annualized income (i.e. 4x regular income + 1x irregular income). Does anyone know how to properly report this in the tax forms? Should I just copy the numbers from my Lohnausweis and the tax authorities will do all the calculations themselves?

I was considering using Private Tax 2010 to fill out the forms, but found the following in the FAQ on the Steueramt's website:

It indeed does not seem to work correctly, as it generates a summary where the rate-determining and actual incomes are equal. Does that mean that I need to fill the forms by hand, or that the forms just don't work in this case?