I agree with Clester. Also, depending on the size of your TSP account you may be able to get by with pulling out only the earnings i.e. 3-4% annually. Should be able to earn that even investing very conservatively (mostly G and/or F). Example, 200,000 balance @ 3 % = $ 6,000 annually or $ 500 month. Tax side - earnings would be taxable and be mostly offset by mortgage interest deduction? That way, you keep your TSP account for real emergencies. Just a thought. Not an easy decision, you are wise to explore a lot of different options. Good luck!