State Administration of Taxation
Finance v1.2.17
Does 电子税务局 work on iPhone Duo?
It works, but with black bars. 电子税务局 1.2.17 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
At a glance
- Inner display (7.6″)
- Black bars
- Outer display (5.4″)
- Works normally
- Built with
- iOS 26.2 SDK
- Version 1.2.17, read Oct 25, 2026
- iPad version
- No
- Phone-only layout today
- Latest version
- v1.2.17
- Aug 10, 2026
- Duo in release notes
- Not yet
About 电子税务局
电子税务局 is made by State Administration of Taxation and first came out on the App Store in April 2024. It has 69 ratings on the US App Store, averaging 1.1 stars. Version 1.2.17 came out on Aug 10, 2026 and needs iOS 12.0 or later. It's free to download.
From its App Store listing:
电子税务局APP是国家税务总局主办的全国统一规范电子税务局移动端，是从用户体验角度出发为纳税人精心设计、提供最适合在移动端办理的涉税业务的一款移动办税工具。主要支持纳税申报、税款缴纳、证明开具、信息报告、发票代开及发票开具等涉税业务办理，并配套提供账户中心、征纳互动在线咨询、反馈问题等功能。
On the inner display
Apps built with older SDKs are placed in a phone-sized safe area on a black background. Everything works; you just don't get the bigger screen.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including 电子税务局. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 1.2.17 is built with the iOS 26.2 SDK
Apple runs apps built with the iOS 26 SDK or earlier in a phone-sized window on the inner display.
- : Not confirmed yet → Black bars — built with the iOS 26.2 SDK
Latest release notes
Version 1.2.17 · Aug 10, 2026
1.优化部分功能的用户体验。
Questions
Does 电子税务局 work on iPhone Duo?
It works, but with black bars. 电子税务局 1.2.17 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does 电子税务局 work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use 电子税务局 in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.
Why does 电子税务局 have black bars on iPhone Duo?
Apps built with the iOS 26 SDK or earlier run in a phone-sized window on the inner display, and iOS 27 builds can still leave some space empty. The bars disappear once the developer rebuilds the app with the iOS 27.1 SDK — you only need to update the app.
When will 电子税务局 fill iPhone Duo's inner display?
When its developer releases an update built with the iOS 27.1 SDK or later. We read the SDK of every new version of 电子税务局 within about a day of its release and update this page.
What can I do about the black bars until then?
Use 电子税务局 on the outer display, where it works like on any iPhone, or put it in Split View next to another app on the inner display so less of the screen goes unused.