Denver/ loan paydown vs. income

[CJ Letzelter]

Given the time of year, I am unable to seek advise from a local Denver CPA combined with living in Singapore have left me with an important question.  Can profits from rent be used to paydown the loan on the same house tax free?  I am not interested in showing a profit at this time therefore am perplexed with reducing my loan terms (30y to 20y) to make the payment close to expected income or allowing a buffer for economic downturns by utilizing a 30 year loan and paydown as long as times are good.  Since my wife and I live and work in Singapore we need tax writeoffs, not additional income.   The interest rate is about the same for 20 and 30 so no motivation to commit to 20 year at this time if the income can be used for loan paydown tax free.