NEW YORK — Credit card company American Express posted a $1.2 billion loss in its latest quarter after booking large one-time charges related to the new tax law. The company also announced it would suspend its share buy-back program for six months to rebuild its capital following the charge.

American Express Co. said Thursday it lost $1.41 a share in the three months that ended Dec. 31, compared with a profit of $825 million, or 88 cents per share, in the same period a year earlier.

Excluding the one-time charges, AmEx said it earned $1.58 a share. Industry analysts had expected $1.54 a share on average, according to FactSet.

Like other banks, American Express had to take significant one-time charges against its results to comply with the new tax law that was enacted in December. The company had $2.6 billion in charges, mostly tied to profits American Express had earned abroad and was now returning to the U.S. under a special one-time tax program. The company also had some deferred tax assets, or credits it could have used toward future tax bills, which it had to write down.

New York-based American Express now expects its corporate tax rate to be around 22 percent.