CLIENT RESOURCE CENTER

EXCLUSIVE MATERIALS, INSIGHTS, & LINKS

Client Portal

Information about using the client portal, how-to videos, and scheduling for personalized assistance.  

Tax Payments

Instructions & links for tax due, extension payments, and estimated tax payments.

Seaport Tax Blog

Visit our tax blog for articles about the latest in tax related news.

FREQUENTLY ASKED QUESTIONS

UPCOMING DEADLINES

  • Tax Documents Due

    March 23, 2026

    For the timely filing of returns due April 15th, please upload or mail all tax documents by March 23rd.

    If documents are sent after this date, we cannot guarantee filing by the tax deadline and an extension may be required.

  • Tax Deadline & Q1

    April 15, 2026

    Individual, Fiduciary, and C-Corp tax returns must be e-filed or extended by this date.

    Q1 Estimated payments are also due, if applicable.

  • Tax-Exempt Return Deadline

    May 15, 2026

    Tax-exempt organization (nonprofit) tax returns must be e-filed or extended by this date.