--- title: "FAXガイドと比較情報 | SingleFax" description: "SingleFaxのFAXガイド：IRS書類、都度払いと月額プランの比較、送付状、スマートフォン・パソコン・Google Driveからの送信。" canonical_url: "https://singlefax.com/ja/blog" locale: ja meta: "og:description": "SingleFaxのFAXガイド：IRS書類、都度払いと月額プランの比較、送付状、スマートフォン・パソコン・Google Driveからの送信。" "og:image": "https://singlefax.com/images/heroes/og-product.jpg" "og:image:alt": FAXガイドと比較情報 "og:image:height": "630" "og:image:type": image/jpeg "og:image:width": "1200" "og:title": SingleFaxブログ --- > Index of every page on this site: [llms.txt](https://singlefax.com/llms.txt) [singlefax](https://singlefax.com/ja) [送信・受信](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E9%80%81%E4%BF%A1) [法人のお客様](https://singlefax.com/ja/%E6%B3%95%E4%BA%BA%E5%90%91%E3%81%91)用途別 [料金](https://singlefax.com/ja/%E6%96%99%E9%87%91) [ブログ](https://singlefax.com/ja/blog)
言語 EnglishDeutschFrançaisEspañolItaliano繁體中文Português do BrasilTürkçe한국어العربية
[ログイン](https://singlefax.com/ja/%E3%83%AD%E3%82%B0%E3%82%A4%E3%83%B3) # FAXのガイドと資料 FAX送信・IRS書式・サービス選びに役立つ実践ガイド。 記事を検索 [

Best Free Fax Numbers Online (2026): Receive Faxes Free

Free fax numbers for receiving in 2026: 24-hour numbers, toll-free options, trials and public queues. How long each lasts, page limits and the catch.更新日2026年10月15日](https://singlefax.com/blog/best-free-fax-numbers-online-2026) [

Best Free Online Fax Services (2026): 7 Options Compared

The best free online fax services in 2026 compared: free sending quotas, free receiving numbers, page caps, expiry and catches, in one table.2026年10月15日](https://singlefax.com/blog/best-free-online-fax-services) [

Form 2848 Instructions 2026: IRS POA Fax Numbers

Find Form 2848 fax numbers by CAF region, with state routing and prefilled send links. Check handwritten signatures and specific-use exceptions.更新日2026年10月15日](https://singlefax.com/blog/fax-form-2848-irs-power-of-attorney-2026) [

Best Online Fax Service for Businesses in 2026 (How to Choose)

How to choose the best online fax service for businesses in 2026. Match pay-per-fax or a monthly plan to how often you fax.更新日2026年10月15日](https://singlefax.com/blog/how-to-choose-the-best-online-fax-service) [

IRS Fax Numbers 2026: Find the Right Form Line

Find official IRS fax numbers by form and routing rule, with source links and prefilled send buttons. Covers EIN, CAF, S-corp and transcript requests.更新日2026年10月15日](https://singlefax.com/blog/irs-fax-numbers-2026) [

Online Fax Security in 2026: 10 Best Practices to Send and Receive Faxes Securely

Is online faxing secure? What is and isn't encrypted, the safest way to receive sensitive faxes to email or a phone, and 10 practical safeguards for 2026.更新日2026年10月15日](https://singlefax.com/blog/online-faxing-security-best-practices) [

POTS Sunset: Migrating Fax to the Cloud Without Downtime

Copper line retirements affect analog fax. Move to a cloud-based fax service without downtime, then send from the online fax provider.更新日2026年10月15日](https://singlefax.com/blog/pots-sunset-cloud-fax-migration) [

Best Online Fax Services 2026: Prices Compared

Compare electronic faxing services by price, free pages, accounts and BAA support. Choose a subscription or one-time send for your actual task.更新日2026年10月15日](https://singlefax.com/blog/top-10-online-faxing-services-compared) [

LLC en Estados Unidos para Extranjeros: Guía y EIN sin SSN (2026)

Guía para abrir una LLC en Estados Unidos sin ser residente: estado, agente registrado, EIN por fax sin SSN, ITIN, cuenta bancaria y el Form 5472 anual.2026年10月15日](https://singlefax.com/es/blog/llc-en-estados-unidos-ein-extranjeros) [

Abrir Empresa nos EUA: LLC e EIN para Brasileiros (Guia 2026)

Guia para abrir empresa nos EUA morando no Brasil: estado, agente registrado, EIN por fax sem SSN, ITIN, conta bancária e o Form 5472 anual.2026年10月15日](https://singlefax.com/pt-br/blog/abrir-empresa-nos-eua-llc-ein) [

Amerika'da Şirket Kurmak: LLC ve SSN'siz EIN Rehberi (2026)

Türkiye'den Amerika'da şirket kurmak: eyalet seçimi, registered agent, SSN olmadan faksla EIN, ITIN, banka hesabı ve her yıl Form 5472.2026年10月15日](https://singlefax.com/tr/blog/amerikada-sirket-kurmak-llc-ein) [

How to Fill Out Form SS-4 and Apply for an EIN by Fax (2026 Walkthrough)

Line-by-line Form SS-4 walkthrough for an EIN by fax: what to write for foreign owners, common mistakes, the return fax and what happens after you send.更新日2026年10月14日](https://singlefax.com/blog/apply-for-ein-by-fax-ss4) 記事 全 79 件のうち 12 件を表示 [記事をさらに読み込む](https://singlefax.com/ja/blog?page=2) [singlefax](https://singlefax.com/ja) 必要なときに、送信も受信も。 [![Google Playで入手](https://singlefax.com/images/google-play-badge.png)](https://play.google.com/store/apps/details?id=com.monocube.singlefax) [Chromeに追加](https://chromewebstore.google.com/detail/singlefax-fax-a-document/ojpmpilgkmjcfebhpkdmmjlkbcifkkej) [LinkedInのSingleFax](https://www.linkedin.com/company/singlefax/) [FacebookのSingleFax](https://www.facebook.com/singlefax) [InstagramのSingleFax](https://www.instagram.com/singlefax.app) [ThreadsのSingleFax](https://www.threads.com/@singlefax.app) [YouTubeのSingleFax](https://www.youtube.com/@singlefax) [GitHubのSingleFax](https://github.com/SingleFax) ## ファクスサービス - [ファクスを送信](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E9%80%81%E4%BF%A1?type=send) - [ファクスを受信](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E9%80%81%E4%BF%A1?type=receive) - [24時間の無料番号](https://singlefax.com/ja/%E7%84%A1%E6%96%99%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E7%95%AA%E5%8F%B7) - [無期限の番号](https://singlefax.com/ja/%E7%84%A1%E6%9C%9F%E9%99%90%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E7%95%AA%E5%8F%B7) - [番号ポータビリティ](https://singlefax.com/ja/%E7%95%AA%E5%8F%B7%E3%83%9D%E3%83%BC%E3%82%BF%E3%83%93%E3%83%AA%E3%83%86%E3%82%A3) - [ファクステスト](https://singlefax.com/ja/%E3%83%86%E3%82%B9%E3%83%88%E7%94%A8%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E7%95%AA%E5%8F%B7) - [法人向けプラン](https://singlefax.com/ja/%E6%B3%95%E4%BA%BA%E5%90%91%E3%81%91) - [HIPAA Secure](https://singlefax.com/ja/hipaa%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9) - [インターネットFAX](https://singlefax.com/ja/%E3%82%A4%E3%83%B3%E3%82%BF%E3%83%BC%E3%83%8D%E3%83%83%E3%83%88fax) - [メールでファクス送信](https://singlefax.com/ja/%E3%83%A1%E3%83%BC%E3%83%AB%E3%81%A7%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9) - [WhatsAppでファクス](https://singlefax.com/ja/whatsapp%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9) ## IRSへの申告 - [IRS申告一覧](https://singlefax.com/ja/irs%E7%94%B3%E5%91%8A) - [EIN · フォームSS-4](https://singlefax.com/ja/ein%E7%94%B3%E8%AB%8B) - [フォーム5472](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A05472%E6%8F%90%E5%87%BA) - [フォーム7004](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A07004%E6%8F%90%E5%87%BA) - [フォーム2553](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A02553%E6%8F%90%E5%87%BA) - [フォーム2848](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A02848%E6%8F%90%E5%87%BA) - [フォーム4506-T](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A04506-t%E6%8F%90%E5%87%BA) - [フォーム8821](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A08821%E6%8F%90%E5%87%BA) - [フォーム8802](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A08802%E6%8F%90%E5%87%BA) - [フォーム8655](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A08655%E6%8F%90%E5%87%BA) - [フォーム3911](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A03911%E6%8F%90%E5%87%BA) - [フォーム8233](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A08233%E6%8F%90%E5%87%BA) - [NY POA-1](https://singlefax.com/ja/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A0ny-poa-1%E6%8F%90%E5%87%BA) ## ツール・資料 - [無料のファクスツール](https://singlefax.com/ja/%E7%84%A1%E6%96%99%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E3%83%84%E3%83%BC%E3%83%AB) - [ファクス用PDFを準備](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E6%BA%96%E5%82%99) - [印刷用テストページ](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E3%83%86%E3%82%B9%E3%83%88%E3%83%9A%E3%83%BC%E3%82%B8) - [ファクス送付状](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E9%80%81%E4%BB%98%E7%8A%B6) - [モバイルアプリ](https://singlefax.com/ja/%E3%83%A2%E3%83%90%E3%82%A4%E3%83%AB%E3%82%A2%E3%83%97%E3%83%AA) - [Chrome拡張機能](https://singlefax.com/ja/chrome%E6%8B%A1%E5%BC%B5%E6%A9%9F%E8%83%BD) - [開発者向け](https://singlefax.com/ja/%E9%96%8B%E7%99%BA%E8%80%85%E5%90%91%E3%81%91) - [AIファクスエージェント](https://singlefax.com/ja/ai%E3%82%A8%E3%83%BC%E3%82%B8%E3%82%A7%E3%83%B3%E3%83%88) - [バージョン管理](https://singlefax.com/ja/%E3%83%90%E3%83%BC%E3%82%B8%E3%83%A7%E3%83%B3%E7%AE%A1%E7%90%86) - [米国下院のファクス番号一覧](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E7%95%AA%E5%8F%B7%E4%B8%80%E8%A6%A7/%E7%B1%B3%E5%9B%BD%E4%B8%8B%E9%99%A2) - [米国上院のファクス番号一覧](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E7%95%AA%E5%8F%B7%E4%B8%80%E8%A6%A7/%E7%B1%B3%E5%9B%BD%E4%B8%8A%E9%99%A2) - [米国州知事のファクス番号一覧](https://singlefax.com/ja/%E3%83%95%E3%82%A1%E3%82%AF%E3%82%B9%E7%95%AA%E5%8F%B7%E4%B8%80%E8%A6%A7/%E7%B1%B3%E5%9B%BD%E5%B7%9E%E7%9F%A5%E4%BA%8B) ## SingleFax - [料金](https://singlefax.com/ja/%E6%96%99%E9%87%91) - [ブログ](https://singlefax.com/ja/blog) - [会社情報](https://singlefax.com/ja/%E4%BC%9A%E7%A4%BE%E6%83%85%E5%A0%B1) - [お問い合わせ](https://singlefax.com/ja/%E3%81%8A%E5%95%8F%E3%81%84%E5%90%88%E3%82%8F%E3%81%9B) - [サポート](https://singlefax.com/ja/%E3%82%B5%E3%83%9D%E3%83%BC%E3%83%88) © 2026 SingleFax [プライバシー](https://singlefax.com/ja/%E3%83%97%E3%83%A9%E3%82%A4%E3%83%90%E3%82%B7%E3%83%BC%E3%83%9D%E3%83%AA%E3%82%B7%E3%83%BC) [利用規約](https://singlefax.com/ja/%E5%88%A9%E7%94%A8%E8%A6%8F%E7%B4%84) [返金](https://singlefax.com/ja/%E8%BF%94%E9%87%91%E3%83%9D%E3%83%AA%E3%82%B7%E3%83%BC) [不正利用を報告](https://singlefax.com/ja/%E4%B8%8D%E6%AD%A3%E5%88%A9%E7%94%A8%E3%81%AE%E5%A0%B1%E5%91%8A) ```json {"@context":"https://schema.org","@graph":[{"@id":"https://singlefax.com/ja#website","@type":"WebSite","description":"SingleFaxなら、スマートフォンやパソコンから必要なときにファックスを送受信できます。登録やアカウントの作成は不要です。","inLanguage":"ja","name":"SingleFax – 必要なときだけファックスを送受信","url":"https://singlefax.com/ja","translationOfWork":{"@id":"https://singlefax.com/#website"}},{"@id":"https://singlefax.com/ja/blog#webpage","@type":"WebPage","description":"SingleFaxのFAXガイド：IRS書類、都度払いと月額プランの比較、送付状、スマートフォン・パソコン・Google Driveからの送信。","name":"FAXガイドと比較情報","url":"https://singlefax.com/ja/blog","isPartOf":{"@id":"https://singlefax.com/ja#website"},"potentialAction":[{"@type":"ReadAction","target":["https://singlefax.com/ja/blog"]}]}]} ```