diff --git a/docs/source/release/v6.16.0/Diffraction/Single_Crystal/New_features/40901.rst b/docs/source/release/v6.16.0/Diffraction/Single_Crystal/New_features/40901.rst
new file mode 100644
index 000000000000..6a31257bd3a2
--- /dev/null
+++ b/docs/source/release/v6.16.0/Diffraction/Single_Crystal/New_features/40901.rst
@@ -0,0 +1 @@
+- Updated IDF for MANDI with latest detector positions calibrated with garnet
diff --git a/instrument/MANDI_Definition_2021-02-01.xml b/instrument/MANDI_Definition_2021-02-01.xml
index a9a733d8d486..b1fa67a7e78c 100644
--- a/instrument/MANDI_Definition_2021-02-01.xml
+++ b/instrument/MANDI_Definition_2021-02-01.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='ASCII'?>
-<instrument xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.mantidproject.org/IDF/1.0" last-modified="2021-03-05 17:20:13.718971" name="MANDI" valid-from="2021-02-01 00:00:00" valid-to="2100-01-31 23:59:59" xsi:schemaLocation="http://www.mantidproject.org/IDF/1.0 http://schema.mantidproject.org/IDF/1.0/IDFSchema.xsd">
+<instrument xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.mantidproject.org/IDF/1.0" last-modified="2021-03-05 17:20:13.718971" name="MANDI" valid-from="2021-02-01 00:00:00" valid-to="2026-01-31 23:59:59" xsi:schemaLocation="http://www.mantidproject.org/IDF/1.0 http://schema.mantidproject.org/IDF/1.0/IDFSchema.xsd">
   <!--DEFAULTS-->
   <defaults>
     <length unit="metre"/>
diff --git a/instrument/MANDI_Definition_2026-02-01.xml b/instrument/MANDI_Definition_2026-02-01.xml
new file mode 100644
index 000000000000..917c5d189bfb
--- /dev/null
+++ b/instrument/MANDI_Definition_2026-02-01.xml
@@ -0,0 +1,502 @@
+<?xml version='1.0' encoding='ASCII'?>
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+    <location x="-0.23775400000000002" y="0.00108" z="0.32234" name="bank39">
+      <rot val="143.6405680663427" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="45.09291609202611">
+          <rot val="-0.0992119004592825" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel40-->
+  <type xstart="-0.0771713671875" xstep="0.000605265625" xpixels="256" ystart="-0.07712953125" ystep="0.0006049375" ypixels="256" name="panel40" is="rectangular_detector" type="pixel"/>
+  <component type="panel40" idstart="2621440" idfillbyfirst="y" idstepbyrow="256">
+    <location x="0.123847" y="0.116032" z="0.379424" name="bank40">
+      <rot val="-148.42335104260863" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="46.65057798513427">
+          <rot val="-22.56969169084492" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel41-->
+  <type xstart="-0.079601337890625" xstep="0.00062432421875" xpixels="256" ystart="-0.07958390625" ystep="0.0006241875000000001" ypixels="256" name="panel41" is="rectangular_detector" type="pixel"/>
+  <component type="panel41" idstart="2686976" idfillbyfirst="y" idstepbyrow="256">
+    <location x="0.335881" y="0.119377" z="0.240916" name="bank41">
+      <rot val="-110.30136658902097" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="47.35625946429028">
+          <rot val="-22.321537835995837" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel42-->
+  <type xstart="-0.078094248046875" xstep="0.00061250390625" xpixels="256" ystart="-0.0781515234375" ystep="0.000612953125" ypixels="256" name="panel42" is="rectangular_detector" type="pixel"/>
+  <component type="panel42" idstart="2752512" idfillbyfirst="y" idstepbyrow="256">
+    <location x="0.407901" y="0.116959" z="-0.0034189999999999997" name="bank42">
+      <rot val="-74.28576646314535" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="47.32935429864161">
+          <rot val="-21.785394985279076" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel46-->
+  <type xstart="-0.077258525390625" xstep="0.00060594921875" xpixels="256" ystart="-0.0772351171875" ystep="0.000605765625" ypixels="256" name="panel46" is="rectangular_detector" type="pixel"/>
+  <component type="panel46" idstart="3014656" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.32697899999999996" y="0.11667299999999999" z="-0.241656" name="bank46">
+      <rot val="69.39399201111164" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="47.087575889488356">
+          <rot val="-22.442175684962926" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel47-->
+  <type xstart="-0.07763455078124999" xstep="0.0006088984375" xpixels="256" ystart="-0.07748912109375" ystep="0.0006077578125" ypixels="256" name="panel47" is="rectangular_detector" type="pixel"/>
+  <component type="panel47" idstart="3080192" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.405073" y="0.11701800000000001" z="-0.003918" name="bank47">
+      <rot val="105.0981136777112" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="47.05509233263884">
+          <rot val="-23.25712171981659" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel48-->
+  <type xstart="-0.077599189453125" xstep="0.00060862109375" xpixels="256" ystart="-0.0776096484375" ystep="0.000608703125" ypixels="256" name="panel48" is="rectangular_detector" type="pixel"/>
+  <component type="panel48" idstart="3145728" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.32876600000000006" y="0.117366" z="0.234298" name="bank48">
+      <rot val="141.94790729440047" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="47.29245021241519">
+          <rot val="-22.651667534606936" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel49-->
+  <type xstart="-0.0818251171875" xstep="0.0006417656250000001" xpixels="256" ystart="-0.081472001953125" ystep="0.00063899609375" ypixels="256" name="panel49" is="rectangular_detector" type="pixel"/>
+  <component type="panel49" idstart="3211264" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.132677" y="0.123313" z="0.402051" name="bank49">
+      <rot val="177.97734932450652" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="47.432857619959584">
+          <rot val="-22.51297752577951" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel50-->
+  <type xstart="-0.076546318359375" xstep="0.00060036328125" xpixels="256" ystart="-0.07665987304687501" ystep="0.00060125390625" ypixels="256" name="panel50" is="rectangular_detector" type="pixel"/>
+  <component type="panel50" idstart="3276800" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.00046199999999999995" y="0.23636500000000002" z="0.373386" name="bank50">
+      <rot val="-151.5205348702325" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="53.640598694029244">
+          <rot val="-41.901758631065874" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel51-->
+  <type xstart="-0.0778925390625" xstep="0.000610921875" xpixels="256" ystart="-0.07803199218750001" ystep="0.000612015625" ypixels="256" name="panel51" is="rectangular_detector" type="pixel"/>
+  <component type="panel51" idstart="3342336" idfillbyfirst="y" idstepbyrow="256">
+    <location x="0.22609" y="0.240858" z="0.307595" name="bank51">
+      <rot val="-116.82376926716702" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="52.54441845298455">
+          <rot val="-41.01749552296313" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel52-->
+  <type xstart="-0.078599765625" xstep="0.0006164687499999999" xpixels="256" ystart="-0.07861520507812501" ystep="0.0006165898437500001" ypixels="256" name="panel52" is="rectangular_detector" type="pixel"/>
+  <component type="panel52" idstart="3407872" idfillbyfirst="y" idstepbyrow="256">
+    <location x="0.368277" y="0.2422" z="0.11622099999999999" name="bank52">
+      <rot val="-79.8152954365627" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="53.38093145148059">
+          <rot val="-41.386231598480954" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel53-->
+  <type xstart="-0.07771623046875001" xstep="0.0006095390625000001" xpixels="256" ystart="-0.07761462890625" ystep="0.0006087421875" ypixels="256" name="panel53" is="rectangular_detector" type="pixel"/>
+  <component type="panel53" idstart="3473408" idfillbyfirst="y" idstepbyrow="256">
+    <location x="0.364941" y="0.239804" z="-0.12201599999999999" name="bank53">
+      <rot val="-43.79935481737636" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="53.477819895311875">
+          <rot val="-41.129879722491246" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel57-->
+  <type xstart="-0.077179833984375" xstep="0.00060533203125" xpixels="256" ystart="-0.07703390625" ystep="0.0006041875" ypixels="256" name="panel57" is="rectangular_detector" type="pixel"/>
+  <component type="panel57" idstart="3735552" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.362614" y="0.239087" z="-0.121862" name="bank57">
+      <rot val="100.04242292016276" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="53.24405232844578">
+          <rot val="-42.31861487816903" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel58-->
+  <type xstart="-0.07759669921875" xstep="0.0006086015625" xpixels="256" ystart="-0.07766642578124999" ystep="0.0006091484375" ypixels="256" name="panel58" is="rectangular_detector" type="pixel"/>
+  <component type="panel58" idstart="3801088" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.36434300000000003" y="0.240232" z="0.113961" name="bank58">
+      <rot val="135.85718517347146" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="53.021363899924246">
+          <rot val="-42.15523491274524" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!--panel59-->
+  <type xstart="-0.07728193359375" xstep="0.0006061328125" xpixels="256" ystart="-0.077246572265625" ystep="0.00060585546875" ypixels="256" name="panel59" is="rectangular_detector" type="pixel"/>
+  <component type="panel59" idstart="3866624" idfillbyfirst="y" idstepbyrow="256">
+    <location x="-0.223932" y="0.238626" z="0.303847" name="bank59">
+      <rot val="172.15542612829302" axis-x="0" axis-y="1" axis-z="0">
+        <rot val="53.418487227584706">
+          <rot val="-42.64454061257518" axis-x="0" axis-y="1" axis-z="0"/>
+        </rot>
+      </rot>
+    </location>
+  </component>
+  <!-- Pixel for Detectors-->
+  <type name="pixel" is="detector">
+    <cuboid id="pixel-shape">
+      <left-front-bottom-point x="-0.000309" y="-0.000309" z="0.0"/>
+      <left-front-top-point x="-0.000309" y="0.000309" z="0.0"/>
+      <left-back-bottom-point x="-0.000309" y="-0.000309" z="-0.0001"/>
+      <right-front-bottom-point x="0.000309" y="-0.000309" z="0.0"/>
+    </cuboid>
+    <algebra val="pixel-shape"/>
+  </type>
+  <!-- Shape for Monitors-->
+  <!-- TODO: Update to real shape -->
+  <type name="monitor" is="monitor">
+    <cylinder id="cyl-approx">
+      <centre-of-bottom-base p="0.0" r="0.0" t="0.0"/>
+      <axis x="0.0" y="0.0" z="1.0"/>
+      <radius val="0.01"/>
+      <height val="0.03"/>
+    </cylinder>
+    <algebra val="cyl-approx"/>
+  </type>
+  <!--MONITOR IDs-->
+  <idlist idname="monitors">
+    <id val="-1"/>
+    <id val="-2"/>
+    <id val="-3"/>
+  </idlist>
+</instrument>
diff --git a/instrument/MANDI_Parameters_2021-02-01.xml b/instrument/MANDI_Parameters_2021-02-01.xml
index b1244f655ad8..d27c3315d457 100644
--- a/instrument/MANDI_Parameters_2021-02-01.xml
+++ b/instrument/MANDI_Parameters_2021-02-01.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<parameter-file instrument = "MANDI" valid-from   ="2021-02-01 00:00:00" valid-to     ="2100-12-31 23:59:59">
+<parameter-file instrument = "MANDI" valid-from   ="2021-02-01 00:00:00" valid-to     ="2026-01-31 23:59:59">
 
 <component-link name = "MANDI">
 <!-- Specify that any banks not in NeXus file are to be removed -->
diff --git a/instrument/MANDI_Parameters_2026-02-01.xml b/instrument/MANDI_Parameters_2026-02-01.xml
new file mode 100644
index 000000000000..212b5fb7954f
--- /dev/null
+++ b/instrument/MANDI_Parameters_2026-02-01.xml
@@ -0,0 +1,86 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<parameter-file instrument = "MANDI" valid-from   ="2026-02-01 00:00:00" valid-to     ="2100-12-31 23:59:59">
+
+<component-link name = "MANDI">
+<!-- Specify that any banks not in NeXus file are to be removed -->
+<parameter name="T0">
+ <value val="0.0"/>
+</parameter>
+
+<!-- Need to fill in gaps for peak profile fitting -->
+<parameter name="fitConvolvedPeak" type="bool">
+ <value val="false"/>
+</parameter>
+
+<!-- Multiplier for profile fitting for BVG polar angle -->
+<parameter name="sigX0Scale">
+ <value val="1." />
+</parameter>
+
+<!-- Multiplier for profile fitting for BVG azimuthal angle -->
+<parameter name="sigY0Scale">
+ <value val="1." />
+</parameter>
+
+<!-- Number of rows between detector gaps for profile fitting -->
+<parameter name="numDetRows" type="int">
+ <value val="255" />
+</parameter>
+
+<!-- Number of cols between detector gaps for profile fitting -->
+<parameter name="numDetCols" type="int">
+ <value val="255" />
+</parameter>
+
+<!-- Number of polar bins for BVG histogramming when profile fitting -->
+<parameter name="numBinsTheta" type="int">
+ <value val="50" />
+</parameter>
+
+<!-- Number of azimuthal bins for BVG histogramming when profile fitting -->
+<parameter name="numBinsPhi" type="int">
+ <value val="50" />
+</parameter>
+
+<!-- Fraction along (h,k,l) to use for profile fitting. 0.5 is the next peak. -->
+<parameter name="fracHKL">
+ <value val="0.25" />
+</parameter>
+
+<!-- Side length of each voxel for fitting in units of angstrom^-1 -->
+<parameter name="dQPixel">
+ <value val="0.003" />
+</parameter>
+
+<!-- Minimum spacing for profile fitting the TOF profile. Units of microseconds -->
+<parameter name="mindtBinWidth">
+ <value val="15" />
+</parameter>
+
+<!-- Maximum spacing for profile fitting the TOF profile. Units of microseconds -->
+<parameter name="maxdtBinWidth">
+ <value val="50" />
+</parameter>
+
+<!-- Size of peak mask for background calculation in units of dQPixel -->
+<parameter name="peakMaskSize" type="int">
+ <value val="5" />
+</parameter>
+
+<!-- Initial guess parameters for coshPeakWidthModel -->
+<parameter name="sigSC0Params" type="string">
+ <value val="0.00413132 1.54103839 1.0 -0.00266634" />
+</parameter>
+
+<!-- Initial guess for sigma along the azimuthal direction (rad) -->
+<parameter name="sigAZ0">
+ <value val="0.0025" />
+</parameter>
+
+<!-- Initial guess parameters for fsigP (BVG covariance) -->
+<parameter name="sigP0Params" type="string">
+ <value val="0.1460775 1.85816592 0.26850086 -0.00725352" />
+</parameter>
+
+</component-link>
+</parameter-file>