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NorthlineAdvisory

Resources

Guides, webinars and calculators

Free tools from our advisors to help you plan, file and stay compliant.

Calculators

Quick, private estimates that run entirely in your browser. Nothing is sent to our servers.

Sales tax estimator

Estimate sales tax on a purchase or invoice using a preset or custom rate.

Combined state and local rate. Rates change; confirm the current rate before filing.

Subtotal
$1,250.00
Sales tax (8.875%)
$110.94
Total
$1,360.94

Estimates are for illustration only and are not tax advice.

Quarterly estimated tax

Estimate federal quarterly payments for self-employment or pass-through income.

Filing status

Uses simplified 2026 brackets, the standard deduction and the self-employment tax rules. State and city taxes are not included.

Net business income
$138,000
Self-employment tax
$19,499
Federal income tax
$19,514
Estimated annual total
$39,013
Effective rate
28.3%

Per quarter

$9,753

Payment schedule

  1. Q1
  2. Q2
  3. Q3
  4. Q4

Estimates are for illustration only and are not tax advice.

Downloadable guides

Concise PDF checklists our clients use every quarter.

Webinars

Live sessions and recordings with our tax and advisory team.

Ready for books you can rely on?

Book a free 30-minute consultation. We will review your current setup and send a fixed-fee proposal within two business days.