Mark PorterIntuit TurboTax Verified Pro
Indy Flat-Tax

Mark Porter

Accepting new clients

  • Verified Pro with 16 years of experience
  • IN
    Indianapolis, IN
Book a free call

I am dedication to staying updated with industry trends and changes in taxes. I am a registered tax professional. I believe in helping customers.


C Corporation (Business Tax Expertise)
Retirement Income
Employee Stock Purchase Plan
Self-Employment Income
S Corporation (Business Tax Expertise)
Partnership (Business Tax Expertise)
Rental Property Income
ISO Exercise
Schedule K-1
Farm Income
Foreign Income
Business Tax Returns
Multi-State Taxes


  • Verified Pro with 16 years of experience
  • Experienced with IN tax code
  • Meet online or in person
  • IN
    Indianapolis, IN

How we’ll work together

Intro call

Schedule an intro call and we’ll meet to go over your tax situation.

Upload your documents

I’ll help you understand what documents you need to upload.

Review and file

After you review, I’ll file your taxes for you. And you’re done!

About me

Mark Porter

Nice to meet you 👋

Mark Porter began his tax journey in October 2006 when he founded Indy Flat-Tax, which he later rebranded as Porter’s Tax Service in May 2023. His path to becoming a seasoned tax professional was forged during his years of dedicated service in the United States Navy. Mark’s journey into the world of taxes began in 1989 when he enlisted in the U.S. Navy. Recognizing the need for accessible tax assistance within the military community, he delved into tax courses and classes focused on military personnel’s unique tax needs. In 1991, Mark took it upon himself to provide free tax assistance to fellow Navy members, sparing them from the burden of hefty fees charged by big tax companies. His commitment to excellence earned him an Associate’s degree in accounting with a major in taxes from Kelsey Jenny College in 1995. Mark continued to serve his country, accumulating 17 years of naval experience, including deployments to international destinations like Hong Kong, Singapore, Africa, and Hawaii. His exceptional service earned him five Navy Achievement Medals and six Good Conduct Awards, also serving during Desert Storm. Indy Flat-Tax

This profile includes statements from the independent professional about their own education, skills, and experience. Intuit has not reviewed these statements for accuracy. See here for Intuit's Pro verification program.

What my clients say

Map showing location of the tax pro
Indy Flat-Tax

Mark Porter

12337 Rustic Meadow Dr, Indianapolis, IN 46229


9:00am - 5:00pm
9:00am - 8:00pm
9:00am - 5:00pm
9:00am - 8:00pm
9:00am - 5:00pm
9:00am - 2:00pm



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