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If you build your own primary residence, and live in for two years or more as your primary residence, any profits on sale would be capital gains tax free (up to certain dollar limits).
Let's say you ponied up $50,000 of your own money, and borrowed $200,000 more to buy and build. You lived there for three years, and sold for $400,000, paying off the loan balance and pocketing the remaining cash. The cash would be yours tax free.
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A certificate of occupancy works very well (the town approves your home for living). Receipts from your moving company, change of address for your mail, driver's license change, all support the move-in date.
Issuance of homeowners insurance is more open ended. It might be issues early, supporting a longer residence period than other documents might...
A utility bill works too. That's even more open ended, since you would have electric service likely well before you move in. A few months bills might do it, since your electric use would go up once you moved in.