The car, the jewelry, the transfer into your account after the new contract: none of it triggers gift tax for you. In fact, the recipient of a gift never pays gift tax under US law; the system, where it applies at all, sits entirely on the giver. And between spouses, it usually does not apply at all.
The unlimited marital deduction between spouses
Federal law allows unlimited tax-free gifts between spouses when the receiving spouse is a US citizen. Unlimited means exactly that: no cap, no form, and no tax: he can transfer any amount of money or property to you, retitle the house, or fund an account in your name, and the unlimited marital deduction wipes out any gift tax consequence. Nothing is reported, by either of you. On the income tax side the answer is just as clean: the tax code excludes gifts from income entirely, so a gift never appears on your Form 1040 no matter the size. The one nuance worth knowing: if the receiving spouse is not a US citizen, the marital deduction is not unlimited. Instead, a special annual exclusion for gifts to a non-citizen spouse applies, an amount well into six figures that adjusts each year, and gifts above it require the giver to file a gift tax return. Even then, it is his filing, and still no income to you.
Gifts before the ring work differently
If you are not yet married, the marital deduction does not apply, and gifts fall under the ordinary rules. A giver may hand any individual up to the annual gift tax exclusion each year with no reporting; the exact amount adjusts annually, so check the current figure. Above that, the giver files Form 709, a gift tax return. Crucially, filing rarely means paying: amounts over the annual exclusion simply count against the giver's lifetime gift and estate tax exemption, a figure in the millions, and actual gift tax is owed only once that lifetime amount is exhausted. Engagement rings, support, and large transfers before marriage are classic examples where a wealthy athlete may have a Form 709 to file while nobody owes a dollar of tax. And in every scenario, married or not, you as the recipient report nothing and owe nothing.
When paperwork exists but tax still is not due
Two boundaries keep this clean. First, gift versus compensation: money for work you actually do, managing his partnerships, running the foundation, working in his LLC, is income, not a gift, regardless of the label, and it belongs on payroll or your Schedule C. Second, big gifts can matter for other planning even when no tax is due: gifted assets carry over their original cost basis, and large transfers interact with estate planning and, in community property states, with how property is characterized. Those are conversations for the household's advisors, not reasons to fear the gift itself. The rule of thumb stands: from your husband, gifts are unlimited and untaxed; from anyone, gifts are never your tax bill.