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Online Banking is in GnuCash realized by the package AqBanking— Aquamaniac's Banking by Martin Preuß. It contains several tools, a library and a few separate helper libraries.

At (machine translation) are availabe:

In times of heavy spam registration is disabled. Then ask on its mailing list.


Currently offered methods:

  • bidirectional, sending of orders possible:
    • the german Financial Transaction Services (FinTS) standard with
      • classical home banking common interface (HBCI) by asymetric key encryption or
      • modern PIN/TAN (2 step authentication) methods;
    • Electronic Banking Internet Communication Standard EBICS, availabe for business clients in AT, CH, DE and FR,
    but because neither AqBanking nor GnuCash devs have access to an test server, upload is currently not implemented. The AqBanking team is searching for users, who volunteer to test on implementing the upload.
  • unidirectional, query only:

The recent stable GnuCash 5.8 bundles contain Aqbanking 6.5.4, the nightly test versions 6.5.12beta.



GnuCash compiles with many available versions of AqBanking and it's helper library Gwenhywfar, except for combinations of new gnucash with old aqbanking and vice versa.

Determinating the Versions

To see your current versions, use the command
$ gnucash --version
GnuCash 3.8 development version
Build ID: git 3.8b-163-g0e6c9e219+(2020-02-19)
$ aqbanking-cli versions
 AqBanking-CLI: 6.0.1
 Gwenhywfar   :
 AqBanking    :
or, if you are using a Flatpak:
$ flatpak run --command=sh org.gnucash.GnuCash
[📦 org.gnucash.GnuCash ~]$ gnucash --version
GnuCash 3.8 development version
Build ID: git e6b3c56+(2020-01-26)
[📦 org.gnucash.GnuCash ~]$ aqbanking-cli versions
 AqBanking-CLI: 6.0.2
 Gwenhywfar   :
 AqBanking    :
[📦 org.gnucash.GnuCash ~]$ exit

In this example you can see, that the user had built a more recent version of GnuCash, but the nightly Flatpak had a more recent AqBanking than her distribution.


This is only an overview mainly for developers. Detailed user instructions are in German: De/Online-Banking

HBCI/FinTS Security Type

AqBanking for FinTS/HBCI needs the definition of a "security medium". Depending on the FinTS/HBCI version, there is a range of choices for this:

Single step authentication
self-generated asymetric keypair with
  • public part given to the bank
  • private part stored on your harddisk, USB stick or floppy disk
supported on all OS, but many banks dropped single step authentication.
Two step authentication
  • You have always to log in your session with your fixed Personal Identification number (PIN).
  • Then each transaction needs authentication with an own Transaction Authentification Number (TAN).
To avoid Man-in-the-middle (MITM) attacks the TANs are ideally transmitted to you over a different medium.
The way the TAN is generated varies by method:
HBCI 2, FinTS 3
PIN/TAN comes in several flavours:
PIN/TAN (classic)
no longer supported by the banks! from a simple paper list: you can enter any unused TAN: supported on all OS
no longer supported by the banks! from an indexed paper list: the bank challenges TAN[i]: supported on all OS
TAN per SMS on your mobile: supported on all OS
The TAN is generated by a chip, which is today integrated in the bank card. You need a card reader to communicate with the chip. Some readers are stand alone devices, but others are connected with your computer. To access the connected readers the library libchipcard from the AqBanking family is required.
Man-in-the-Middle Attacks against the chipTAN comfort Online Banking System
several optical methods
Since version 4.3 GC supported the flickering image. GC does not generate the flickering image, but you can manually enter the displayed number in your TAN generator. Bug 667490 - Support image-based TAN methods QR, photoTAN, and chipTAN optical "Flicker code"
Flicker code
The number is transferred in nibbles plus parity bit by an animated gif.
QR code
can be decoded by smartphones.
Photo TAN
The TAN is sent as a photo.
There is a more precise description: Aqbanking Wiki: Implement Tan Methods
For this standard methods some banks use own names created by their marketing department like sm@rtTAN.


FinTS Test Server

There are no currently documented instructions. There is no known test account with a testing bank server. To our knowledge anyone who wants to test this needs an account at a German bank. Sorry for that.


If there are any problems during the HBCI or OFX connection, here are further options for debugging:

  1. In Gnucash in Edit->Preferences->Online Banking:
    1. Disable Close log window when finished[1] ,
    2. enable Verbose debug messages. Since Gnucash 2.3.x this is related to AQBANKING_LOGLEVEL.
  2. To see much more log messages of aqbanking, you can set several environment variables either before starting gnucash or in the shell script gnucash or gnucash.bat. For example, in a Unix shell you would type
    # General:
    export GWEN_LOGLEVEL=info # usually only developers need this sometimes.
    export AQBANKING_LOGLEVEL=info
    # For OFX:
    export AQOFX_LOG_COMM=1 # Warning: Will reveal passwords!
    # For FinTS/HBCI:
    export AQHBCI_LOGLEVEL=info # Warning: Will reveal passwords!
    For AQOFX_LOG_COMM see Setting_up_OFXDirectConnect#Enabling_the_OFX_Log,
other possible values to all other of these variables are
  • debug (more verbose) or
  • warn (less verbose) or
  • error (even less verbose, default value).
However, the Gwenhywfar log messages are all sent to stdout or stderr, which on Windows by default isn't available. To make these available on Windows, you need to change the exetype of gnucash-bin.exe from "Windows" to "Console", see Windows Debugging#Changing the Exetype to See Console Output.
AQBanking log messages are intercepted by a GnuCash callback and added to the Trace_file. N.B.: That callback does a second filter on log level so it's necessary to set the AQBanking log level in GnuCash as well as setting the AQBANKING_LOGLEVEL by passing the argument --log aqbanking=xxx to GnuCash, e.g.
AQBANKING_LOGLEVEL=info gnucash --log aqbanking=info
or adjust your logging configuration.
  • Keep in mind that there are many many many different bank servers on this world, and every one of them might behave slightly differently. Hence, if you report a bug, please also state which bank server you are using (IP address and bank name).
  • If there is a crash, it would be good to provide a stack trace of the crash, see Stack Trace.

AqBanking Specific Storage Locations

AqBanking is still using a classical Linux DOT directory instead of the XDG standard.

Environmemt Variable AQBANKING_HOME

The default is
.aqbanking is a hidden directory in the user's home directory,

Log Location

As for aqbanking up to version 5.x.x: AqBanking stores log files for HBCI under Linux in

${AQBANKING_HOME}/backends/aqhbci/data/banks/<country code>/<Bank ID>/logs/*.
<country code> your ISO country code such as "de",
<Bank ID> the name or the routing number of your bank (in German: BLZ).

To enable logging of the OFX communication to /tmp/ofx.log (with warnings about revealing passwords), see Setting up OFXDirectConnect in GnuCash 2#Enabling the OFX Log.

Anonymization of log files
Before you show your log files to anybody, you should replace passworda, PINs, TANs and other secrets by Xes. Before publishing them e.g. sending to a mailing list, replace also your account number. In theory this can also be done with
aqhbci-tool4 logfile -i $INPUTLOGFILE -o $OUTPUTLOGFILE
But verify that the program did not miss some.

Config Location

Most parts are stored by the setup assistent below


Gnucash stores only an association in the account's slots in the data file.

Example from an uncompressed xml file:
      <slot:value type="frame">
           <slot:value type="string">1234567890</slot:value>
           <slot:value type="integer">9</slot:value>
          <slot:value type="string">121107882</slot:value>
          <slot:value type="timespec">
            <ts:date>2017-08-27 09:33:08 -0700</ts:date>
The account number.
AQBanking's internal id for the account.
The national bank id: In the US it's the Routing ID.
Timestamp for the last time a retrieval attempt was made for this account.

GnuCash, Aqbanking or Other Error

  • If you can execute an operation successful with the aqbanking command line tools, but not with gnucash, it is obvisious a GnuCash issue.
  • Else the issue might be in
  1. your settings,
  2. the bank's configuration,
  3. AqBanking.
Which Aqbanking CLI tools exist?
$ aq[TAB][TAB]
aqbanking-cli     aqbanking-config  aqebics-tool      aqhbci-tool4      aqpaypal-tool     
$ aqbanking-cli --help
This is version 6.2.1

Global Options:
aqbanking-cli serves for executing online actions after configuration.
aqbanking-config covers the general part of the configuration, while the others configure the backend specific parts.


use to get a usable translation of the pages.

Git Repositories

AqBanking Git repositories of source code can be found here (mirrored at ):

git clone   # the library
git clone  # its OS abstraction layer as dependency
git clone # optional for the use of chipcard readers

There are also gitweb browser interfaces at , .

Unofficial GitHub Mirrors

Some community members set up (unofficial) github mirrors:

Christian Stimmig
There is also a continuous integration build test of gwenhywfar here:
Felix Schwarz, Lukas Matt
A bot script updates the "" mirror on a daily basis so it should always be up-to-date.

Currently Unsupported Open Standards

The methods supported by AqBanking create a direct connection between you, the customer, and your bank. In contrast the 'Access to Account (XS2A) Open Banking Framework' serves to allow a FinTech in your name a connection to your bank. Some consider that as dangerous.

While many banks still think Security by obscurity is a good concept, in some countries they are changing their opinion:

  1. This setting affects only GnuCash's dialogs—Action->…. Most dialogs of Tools->Online Banking Setup are provided by AqBanings library Gwenhywfar.
  2. Retrieved from ""