President Barack Obama's healthcare overhaul law, upheld by the Supreme Court on Thursday, contains a slew of new tax provisions.

Some have been put into effect in the two years since Obama signed the law, including a tanning salon tax and tax credits for small businesses. Other provisions will be phased in over time.

Here is a look at major tax provisions in Obama's Patient Protection and Affordable Care Act.

IN EFFECT

* Small business tax credits. For businesses with fewer than 25 workers and average annual wages of less than $50,000 a person, the credit is meant to offset the costs of healthcare coverage provided by the businesses. Set now at up to 35 percent of employer contribution for small employers and 25 percent for tax-exempt employers, the credit will rise by 2014 to up to 50 percent.

* Drugmaker fees. An annual fee on drugmakers based on sales and market share, this will raise $2.8 billion in government revenue for 2012-2013, rising to $4.1 billion in 2018. The fee then ticks back down to raise $2.8 billion in 2019 and later.