Buying a car with a cashiers check?

my mom is going to buy a bmw m5 and total its going to cost about 95,000

and she has enough money to pay for this all and she wants to do it with a cashiers check

how will this affect her taxes
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It depends upon the source of the money.

If the money has been in a taxable account (savings, checking, etc), taxes have already been paid on the money. Can't tax it twice.

If it's coming from a tax deferred source (retirement account, IRA, etc.), she'll have to pay ordinary income taxes on it.

If it's coming from selling stocks, she'll be taxed on the gains (profit) from the sale of the stocks.

You should talk to a tax adviser for her specific situation.

If Nevada charges sales taxes on private auto sales, she'll have to pay sales tax on the purchase directly to the state of Nevada, not the private owner. Otherwise, pay sales tax to the dealer.
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Are you asking about her federal income taxes? As long as everything is legitimate about the transaction (meaning that she came by the money legitimately, and has been paying taxes on it while it was in the bank), it shouldn't have any impact upon her federal taxes. Federal income tax isn't directly affected by your purchases.

The government only gets interested if they think you're paying large amounts by cash to avoid reporting income, or that the money was obtained as part of a criminal operation, such as selling drugs. To guard against money laundering, there is a rule that some large cash transactions have to be reported to the government--but if everything is legitimate with your transaction, it won't matter to you and won't effect your taxes.

She will have to pay, as part of the purchase, any federal, state, or local taxes that have to do with purchasing a car, such as federal excise tax and any state and local taxes upon purchases, such as sales tax.
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Auto finance is what I do for a living and a cashiers check is the same as any other check so there will be affect on her taxes.
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A cashiers check is the same as any other check, will affect her taxes.