Large First Class Envelopes

1st Class window envelopes for tax returns and official documents.

  • 1st Class envelopes at discount prices
  • 9″ x 12″ Window envelopes and more
  • Expanding envelopes too
  • First class mail envelopes in stock and ready to ship!

1st Class Envelope
with Windows

Our Price: $185.00 qty 500
Greatland® $250.50 qty 500

Order Now

6×9 Window Envelopes
Self-Adhesive

Our Price: $38.00 qty 100
Greatland® $61.30 qty 100

Order Now

Official first class mailing envelopes with windows for important documents at discount prices – no coupon needed.

Shop Easy with The Tax Form Gals!

Tax Form Gals at Discount Tax Forms - DiscountTaxForms.com

Double Window First Class Envelopes – Vertical Portrait Format

  • 9-1/2 x 12 Large First Class Envelope Double Windows in the Center for address cover sheets PES45 PEO41 - Discount Tax Forms

    Double, Center Windows First Class Mail Envelope – 9-1/2″ x 12″

  • Large First Class Mail Envelope with Offset Double Windows, 9-5/8 x 11-1/8, compatible with CCH Prosystem tax software slipsheets - Discount Tax Forms

    First Class Mail Envelope with Offset Windows – 9-5/8″ x 11-1/8″

  • Large First Class Mail Envelope Blue Double Alternate Windows for UltraTax Software Address Slipsheets9.5 x 12 PEQ43 - Discount Tax Forms

    First Class Mail Envelope with Alternate Windows – 9-1/2″ x 12″

  • Large First Class Mail Envelopes with Top Windows, Green Border for Software Coversheets PEU21 PEL12 - DiscountTaxForms.com

    First Class Mail Envelope with 2 Top Windows – 9-1/2″ x 11-1/2″

  • Large Client Tax Return Mailing Envelope with Stars and Stripes Design, Portrait-Vertical Format - DiscountTaxForms.com

    Stars & Stripes Envelope – Center Double Window – 9-1/2″ x 12″

  • Blank Oversized Mailing Envelope with 2 Large Windows in the Center PET46 - DiscountTaxForms.com

    Large Blank Envelopes with 2 Center Windows – Portrait Style – 9-1/2″ x 12″

  • Large First Class Envelope with Small Top and Large Bottom Window for Tax Software Slipsheets for Address - DiscountTaxForms.com

    First Class Envelope with Small Top and Large Window – 9-1/2″ x 11-1/2″

  • Large, First Class Mail Envelope, Double Windows in Center for Tax Software Coversheets - DiscountTaxForms.com

    First Class Mail Envelope with 2 Center Windows – 9-1/2″ x 11-1/2″

  • Expanding First Class Mail Envelope with Alternate Windows Tyvek. Compatible with Creative Solutions, UltraTax, ATX, CCH and Prosystem software.

    Expanding Tyvek First Class Mail Envelope with Alternate Windows – 9″ x 12″ x 2″

  • Large White Envelope with Double Windows, Offset for To and From Address - DiscountTaxForms.com

    Large, Blank Double Window Envelope with Alternate Window Placement – 9-1/2″ x 12″

Double Window First Class Envelopes – Horizontal Landscape Format

  • Landscape Format, Large First Class Mail Envelopes Double Window Blue PER44 PEY51 - Discount Tax Forms

    First Class Envelope, Landscape Style with Double Windows – 12″ x 9-1/2″

  • Landscape Format First Class Envelopes 13x10 with Alternate Offset Double Windows PEB02 - Discount Tax Forms

    Oversized Landscape First Class Mail Envelope with Double Windows – 13″ x 10″

  • Landscape, Horizontal Format First Class Mail Envelope with 2 Windows, Smaller Top Window, Green Border - DiscountTaxForms.com

    Landscape First Class Mail Envelopes with Smaller Top Window – 9-1/2″ x 11-1/2″

  • First Class Mail Envelope with Confidential Text on Front, Horizontal Landscape Style with 2 Windows - DiscountTaxForms.com

    Landscape First Class Mail Envelope, Double Window, Confidential Text – 9-1/2″ x 11-1/2″

  • Large First Class Mail Envelope, Horizontal Landscape Format with 2 Cellophane Windows - DiscountTaxForms.com

    Large First Class Mail Envelope, Landscape Style with 2 Windows – 11-1/2″ x 9-1/2″

  • Large, First Class Mail Envelopes with Confidential Text, Horizontal Landscape Format, Double Window - DiscountTaxForms.com

    First Class Mail Envelope, Landscape Style with Confidential Text – 11-1/2″ x 9-1/2″

  • Horizontal, Landscape Format Double Window First Class Mail Envelope for Tax Software Address Slipsheets - DiscountTaxForms.com

    First Class Envelope, Landscape Style with 2 Windows, Long-Side Open – 11-1/2″ x 9-1/2″

  • Small, Double Window First Class Mail Envelope, 6x9 - DiscountTaxForms.com

    Small First Class Mail Envelope, Double Windows – 6″ x 9″

  • Large First Class Mail Envelopes, Double Window (Smaller Top Window), Compatible with Software Address Coversheets - DiscountTaxForms.com

    Landscape First Class Mail Envelope with Smaller Top Window – 11-1/2″ x 9-1/2″

  • Large, Double Window First Class Mail Envelope, Horizontal Landscape Format compatible with Taxwise software slipsheets - DiscountTaxForms.com

    First Class Mail Envelope, Landscape Format with Double Windows – 11-1/2″ x 9-1/2″

  • Expanding First Class Mail Envelope Landscape Style Double Window Confidential Text 80343EXP - DiscountTaxForms.com

    Expandable Landscape First Class Mail Envelope, Double Window, Confidential Text – 9-1/2″ x 12″ x 1″

Single Window First Class Envelopes
  • Client Income Tax Return Envelope with Window for 1040 Address - DiscountTaxForms.com

    Income Tax Return Envelope with 1040 Window – 9-1/2″ x 11-1/2″

  • 1st Class Mail Envelope with One Single Center Window for Address Coversheets - DiscountTaxForms.com

    First Class Envelope with Single Center Window – 9-1/2″ x 12″

  • 1st Class Mail Envelope with One Single Window for Address Coversheets, Compatible with Tax Software - DiscountTaxForms.com

    First Class Envelope with Single Window – 9-1/2″ x 11″

  • Large Single Window Envelope "Important Information Enclosed" with Stars and Stripes Design in Blue 80920 - DiscountTaxForms.com

    Stars & Stripes Tax Envelope with Single Top Window – 9-1/2″ x 11-1/2 “

  • Large, Single Window Envelope for First Class Mail, Important Information Enclosed PEH34 - DiscountTaxForms.com

    First Class Envelope with Single, Center Window – 9-1/2″ x 11-1/2″

  • Patriotic Tax Envelope with Window for easy, official mailing PEB28 - Discount Tax Forms

    Patriotic Tax Envelope with Window – 9-1/2″ x 11-1/2″

  • Important Tax Return Information Enclosed, Client Tax Return Envelope with 1040 Window - DiscountTaxForms.com

    Important Tax Information Envelope with Window – 9-1/2″ x 11-1/2″

  • Large First Class Mail Envelope with One, Single Top Window and Blue Border - DiscountTaxForms.com

    First Class Mail Envelope with Single Top Window – 9-1/2″ x 11-1/2″

  • Large 1st Class Mail Envelope with One, Single Center Window for Address Coversheets, Green - DiscountTaxForms.com

    First Class Mail Envelope with Single Center Window, Green – 9-5/8″ x 11-1/8″

Software-Compatible Tax Envelopes