He avoids paying taxes on the sale of stocks to finance the home.
Mortgage interest is tax deductible.
His stocks will almost certainly yield more than the interest rate on the mortgage.
He's getting a sweetheart deal from the bank.
For him, selling stock is a PITA because he has special class of stock that grant him voting rights far beyond what a normal share is worth. These special shares are granted to him by the board of directors. So selling 1 share means losing like 1000 votes (they convert back to 1:1 upon sale), meaning he needs to be careful when liquidating assets. By waiting five years, he can use vested options to pay the mortgage, rather than selling his special class stock.
Also, free country and all, taking advantage of that special rate is still rather unsettling.
Can you elaborate on that?
Just to note: you don't :) In fact, if you wanted to pay all cash, and had enough shares, you'd generally take out a portfolio loan against the shares at some very low interest rate (probably not lower than current mortgage rates however) rather than sell the shares at all.
Whether this is better/worse than a mortgage depends on various things.
In practice, not for zuck.
1. Only the interest on the first 1 million is deductible. 2. The income phaseout probably also hits him hard
The good news is that AMT comes along and typically eats up deducting property taxes and other things, but the mortgage interest itself still works.
EDIT: see comment below. One can deduct the interest on mortgages up to $1MM and $500k, but there is a cap on itemised deductions (mortgage interest deductions are this kind of deduction) around $450k.
http://www.bankrate.com/calculators/mortgages/loan-tax-deduc...
From your link: Taxpayers can deduct the interest paid on first and second mortgages up to $1,000,000 in mortgage debt (the limit is $500,000 if married and filing separately).
So mortgage interest for loans beyond $1M are not deductible at all.
Then there is the deduction phase-out
> You are subject to the limit on certain itemized deductions if your adjusted gross income (AGI) is more than $309,900 if married filing jointly or qualifying widow(er), $284,050 if head of household, $258,250 if single, or $154,950 if married filing separately. Your AGI is the amount on Form 1040, line 38.
We need to overhaul the tax system, not pile more crap on top of it.
Besides, the vast majority of people taking advantage of this deduction is the normal American. Not a business owner or speculator. You'd be ending the largest tax relief the middle class has.
If you have to sell stocks to pay cash for a home, a mortgage could cost you less money overall.