Trouble at YouTube helped tamp down profit at Google parent Alphabet — pushing shares of the company down as much as 5 percent in after-hours trading before recouping half of its loss.

The Silicon Valley giant’s fourth-quarter profit was also impacted by higher marketing expenses.

The company reported profits, excluding the impact of the tax law change, of $9.70 a share — short of the $10.04 expected by analysts.

Alphabet’s fourth-quarter revenue of $32.32 billion — a 24 percent increase — beat the $31.86 billion expected by a consensus of analysts.

The Dec. 22 Tax Act saddled Alphabet with a fourth-quarter expense of $9.9 billion — a one-time transition tax on accumulated foreign subsidiary earnings — that resulted in a net loss of $3 billion.

Google’s mostly search-derived advertising revenue accounted for $27.2 billion, or 84 percent, of total Alphabet sales. That amount contains the 11 percent of Google ad revenue that eMarketer attributes to YouTube, the company’s video-sharing Web site.

Alphabet also reported that “other revenue” — a category that includes its cloud business, hardware sales and app store — increased nearly 40 percent, to $4.7 billion.

On a conference call with analysts, CEO Sundar Pichai called the cloud unit “a billion dollar per quarter business.”

Alphabet’s total costs and expenses increased 27 percent during the quarter — 3 percentage points greater than revenue — which caused the operating margin to narrow by 1 percentage point to 24 percent.

Google had to deal with advertiser outrage over their ads appearing alongside videos with offensive content.

Some advertisers pulled back on spending — demanding better management of their ad dollars by Google.