Hi Mstelick, no, there isn't an income threshold of rental income that triggers the need to make quarterly estimated tax payments. When you report your rental income and expenses (including depreciation, a relatively large deduction customers sometimes overlook by neglecting to add the rental property in the asset entry screens), the net amount of profit is included in your Taxable Income, along with your wages. If there's a loss (usually because of the depreciation deduction), you may be able to offset your salary by up to $25,000 if you actively participate in the management / operation of your rental property. The amount of tax on this taxable income is reduced by credits (if applicable) and the tax withholding from your employment and any estimated payment you made. Here's are a couple resources that provide more details about rental properties and estimated taxes:
Rental Real Estate and Taxes
Estimated Taxes: How to Determine What to Pay and When
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