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18 votes
1 answer
4k views

Why does the TD Bank principal portion of a mortgage payment go up and down in sawtooth? (why is interest payment on annuity in arrears non-monotonic)

I'm trying to understand the amortization schedules of TD mortgages, as produced by the TD Calculator. The monthly payment amounts (on this fixed rate mortgage) are predictable and constant, but the ...
pf_init_js's user avatar
3 votes
2 answers
344 views

Mathematics behind deciding to do a lump sum mortgage payment vs. RRSP contribution?

If I have 10,000 extra dollars, how could I decide between doing either: A lump sum mortgage prepayment (2.1% variable closed interest rate, 250k remaining balance), or, An RRSP contribution (...
Victor123's user avatar
  • 16k