Hello Mustachians, this is my first post and I just had a few questions about some of the concepts of Mustachianism savings rate goals. When figuring out your savings rate, does the principal portion of your mortgage count as saving (investing in not having to pay rent down the road)...Also, do you factor in the tax rate when determining your savings rate?
Depends on what you want to do with the results of the calculation. If you want to plot the number over time so you can see whether it goes up or down, do whatever feels good to you.
If you want to use it as input to a back-of-the-envelope "how long until am I FI?" calculation, you may want to ignore "savings ratio" and "mortgage payments" completely, and use
Time in years to FI = Ln((S + i*E/WR) / (S + i*A)) / Ln(1 + i)
A = Asset amount currently invested in funds you will draw upon in retirement.
E = Total (including taxes) annual expenses in retirement
i = Return on invested retirement funds.
S = Annual amount invested in funds you will draw upon in retirement.
WR = Withdrawal Rate planned for retirement, using Trinity Study definitions.
and does employer contributions to pension plans count towards savings rate, as I get 9% pension whether I contribute a dime or not.
Not sure how your pension works, so adjust what follows as needed.
A non-inflation-adjusted annuity/pension doesn't quite fit into the framework assumed by the Trinity Study folks, due precisely to the lack of inflation adjustment.
Taking a deduction from annual spending and using 25-30 times (actual spending minus annuity) isn't exactly correct because the annuity becomes a smaller fraction over time. Treating it as part of net worth isn't exactly correct because it won't appreciate in value as a stock & bond portfolio would.
One can always make some approximations, however. E.g., use (expenses minus "annuity payment discounted by 10 years of inflation") or "use a lower assumption for total stash growth" in the above equation.
See
http://forum.mrmoneymustache.com/ask-a-mustachian/do-you-count-the-principal-part-of-your-mortgage-payment-in-your-savings-calc/ for more discussion.