How much can your employees contribute to 401(k) plans this year? How much do employees have to earn in 2020 before they can stop paying Social Security tax? An array of tax limits affecting businesses are annually indexed for inflation, and many have increased for 2020. Here are some that may be important to you and your business. Social Security tax The amount of employees’ earnings that are subject to Social Security tax is capped for 2020 at $137,700 (up from $132,900 for 2019). Deductions Section 179 expensing: Limit: $1.04 million (up from $1.02 million for 2019) Phaseout: $2.59 million (up from $2.55 million) Income-based phase-out for certain limits on the Sec. 199A qualified business income deduction begins at: Married filing jointly: $326,600 (up from $321,400) Married filing separately:...